Finding the Fourth Proportional to 72,438.86, 99,961.47 and 42,229.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72,438.86 : 99,961.47 = 42,229.10 : x
2. Step 2: Convert to fraction form
   72,438.86/99,961.47 = 42,229.10/x
3. Step 3: Cross multiply
   72,438.86x = 99,961.47 × 42,229.10
4. Step 4: Simplify right side
   72,438.86x = 4,221,282,412.97
5. Step 5: Solve for x
   x = 4,221,282,412.97/72,438.86
6. Step 6: Final answer
   x = 58,273.73