Finding the Fourth Proportional to 72,160.14, 99,581.15 and 40,329.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,160.14 : 99,581.15 = 40,329.05 : x
2. Step 2: Convert to fraction form
   72,160.14/99,581.15 = 40,329.05/x
3. Step 3: Cross multiply
   72,160.14x = 99,581.15 × 40,329.05
4. Step 4: Simplify right side
   72,160.14x = 4,016,012,477.86
5. Step 5: Solve for x
   x = 4,016,012,477.86/72,160.14
6. Step 6: Final answer
   x = 55,654.17