Finding the Fourth Proportional to 1,820,288,213.69, 2,730,553,395.57 and 639,725,911.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820,288,213.69 : 2,730,553,395.57 = 639,725,911.55 : x
2. Step 2: Convert to fraction form
   1,820,288,213.69/2,730,553,395.57 = 639,725,911.55/x
3. Step 3: Cross multiply
   1,820,288,213.69x = 2,730,553,395.57 × 639,725,911.55
4. Step 4: Simplify right side
   1,820,288,213.69x = 1,746,805,760,003,313,152
5. Step 5: Solve for x
   x = 1,746,805,760,003,313,152/1,820,288,213.69
6. Step 6: Final answer
   x = 959,631,418.18