Finding the Fourth Proportional to 72,158.90, 99,580.41 and 40,329.86

Step by Step Solution

1. Step 1: Write the proportion equation
   72,158.90 : 99,580.41 = 40,329.86 : x
2. Step 2: Convert to fraction form
   72,158.90/99,580.41 = 40,329.86/x
3. Step 3: Cross multiply
   72,158.90x = 99,580.41 × 40,329.86
4. Step 4: Simplify right side
   72,158.90x = 4,016,063,994.04
5. Step 5: Solve for x
   x = 4,016,063,994.04/72,158.90
6. Step 6: Final answer
   x = 55,655.84