Finding the Fourth Proportional to 911,839,004.80, 1,258,338,902.79 and 494,151,290.10

Step by Step Solution

1. Step 1: Write the proportion equation
   911,839,004.80 : 1,258,338,902.79 = 494,151,290.10 : x
2. Step 2: Convert to fraction form
   911,839,004.80/1,258,338,902.79 = 494,151,290.10/x
3. Step 3: Cross multiply
   911,839,004.80x = 1,258,338,902.79 × 494,151,290.10
4. Step 4: Simplify right side
   911,839,004.80x = 621,809,792,196,696,960
5. Step 5: Solve for x
   x = 621,809,792,196,696,960/911,839,004.80
6. Step 6: Final answer
   x = 681,929,363.54