Finding the Fourth Proportional to 72,147.99, 99,562.32 and 40,317.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72,147.99 : 99,562.32 = 40,317.15 : x
2. Step 2: Convert to fraction form
   72,147.99/99,562.32 = 40,317.15/x
3. Step 3: Cross multiply
   72,147.99x = 99,562.32 × 40,317.15
4. Step 4: Simplify right side
   72,147.99x = 4,014,068,989.79
5. Step 5: Solve for x
   x = 4,014,068,989.79/72,147.99
6. Step 6: Final answer
   x = 55,636.60