Finding the Fourth Proportional to 72,439.86, 99,962.85 and 42,230.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72,439.86 : 99,962.85 = 42,230.10 : x
2. Step 2: Convert to fraction form
   72,439.86/99,962.85 = 42,230.10/x
3. Step 3: Cross multiply
   72,439.86x = 99,962.85 × 42,230.10
4. Step 4: Simplify right side
   72,439.86x = 4,221,441,151.79
5. Step 5: Solve for x
   x = 4,221,441,151.79/72,439.86
6. Step 6: Final answer
   x = 58,275.11