Finding the Fourth Proportional to 72,002.86, 99,363.56 and 40,171.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72,002.86 : 99,363.56 = 40,171.68 : x
2. Step 2: Convert to fraction form
   72,002.86/99,363.56 = 40,171.68/x
3. Step 3: Cross multiply
   72,002.86x = 99,363.56 × 40,171.68
4. Step 4: Simplify right side
   72,002.86x = 3,991,601,135.98
5. Step 5: Solve for x
   x = 3,991,601,135.98/72,002.86
6. Step 6: Final answer
   x = 55,436.70