Finding the Fourth Proportional to 72,185.15, 99,615.72 and 40,354.04

Step by Step Solution

1. Step 1: Write the proportion equation
   72,185.15 : 99,615.72 = 40,354.04 : x
2. Step 2: Convert to fraction form
   72,185.15/99,615.72 = 40,354.04/x
3. Step 3: Cross multiply
   72,185.15x = 99,615.72 × 40,354.04
4. Step 4: Simplify right side
   72,185.15x = 4,019,897,149.88
5. Step 5: Solve for x
   x = 4,019,897,149.88/72,185.15
6. Step 6: Final answer
   x = 55,688.70