Finding the Fourth Proportional to 72,185.88, 99,619.61 and 40,354.77

Step by Step Solution

1. Step 1: Write the proportion equation
   72,185.88 : 99,619.61 = 40,354.77 : x
2. Step 2: Convert to fraction form
   72,185.88/99,619.61 = 40,354.77/x
3. Step 3: Cross multiply
   72,185.88x = 99,619.61 × 40,354.77
4. Step 4: Simplify right side
   72,185.88x = 4,020,126,247.27
5. Step 5: Solve for x
   x = 4,020,126,247.27/72,185.88
6. Step 6: Final answer
   x = 55,691.31