Finding the Fourth Proportional to 99,665,628.10, 149,498,442.15 and 72,791,772.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99,665,628.10 : 149,498,442.15 = 72,791,772.10 : x
2. Step 2: Convert to fraction form
   99,665,628.10/149,498,442.15 = 72,791,772.10/x
3. Step 3: Cross multiply
   99,665,628.10x = 149,498,442.15 × 72,791,772.10
4. Step 4: Simplify right side
   99,665,628.10x = 10,882,256,530,287,834
5. Step 5: Solve for x
   x = 10,882,256,530,287,834/99,665,628.10
6. Step 6: Final answer
   x = 109,187,658.15