Finding the Fourth Proportional to 99,723,746.77, 149,812,624.78 and 72,142,737.28

Step by Step Solution

1. Step 1: Write the proportion equation
   99,723,746.77 : 149,812,624.78 = 72,142,737.28 : x
2. Step 2: Convert to fraction form
   99,723,746.77/149,812,624.78 = 72,142,737.28/x
3. Step 3: Cross multiply
   99,723,746.77x = 149,812,624.78 × 72,142,737.28
4. Step 4: Simplify right side
   99,723,746.77x = 10,807,892,830,175,870
5. Step 5: Solve for x
   x = 10,807,892,830,175,870/99,723,746.77
6. Step 6: Final answer
   x = 108,378,326.93