Finding the Fourth Proportional to 128,469,116.61, 177,282,793.71 and 72,713,339.91

Step by Step Solution

1. Step 1: Write the proportion equation
   128,469,116.61 : 177,282,793.71 = 72,713,339.91 : x
2. Step 2: Convert to fraction form
   128,469,116.61/177,282,793.71 = 72,713,339.91/x
3. Step 3: Cross multiply
   128,469,116.61x = 177,282,793.71 × 72,713,339.91
4. Step 4: Simplify right side
   128,469,116.61x = 12,890,824,039,229,640
5. Step 5: Solve for x
   x = 12,890,824,039,229,640/128,469,116.61
6. Step 6: Final answer
   x = 100,341,812.72