Former US President Gerald Ford died on 26 December aged 93. He was the longest-living US president.
Funeral services began in California on Friday, when his body was carried from a church close to where he lived.
President Ford's body was taken to the Capitol Rotunda in Washington on Saturday where the first part of a state funeral service was held.
His widow, Betty, and the couple's children spoke to mourners as they filed past the casket.
President Bush and First Lady Laura Bush were among those paying their respects on Monday.
The flag-draped coffin was then taken from the Capitol down the Senate steps on its way to the funeral service to be held at the National Cathedral.
A 21-gun salute rang out and a military band played as Mr Ford's coffin was carried out.
Fanfare for the Common Man was among the music played at the funeral. President Bush said: "In President Ford, the world saw the best of America."
The coffin then left the funeral to be taken to Grand Rapids, Michigan, for burial near Mr Ford's presidential library at a private service on Wednesday.
"He did his duty as a leader, not as a performer playing to the gallery," said Mr Ford's Secretary of State Henry Kissinger.