Finding the Fourth Proportional to 71,403.55, 107,002.72 and 40,172.83

Step by Step Solution

1. Step 1: Write the proportion equation
   71,403.55 : 107,002.72 = 40,172.83 : x
2. Step 2: Convert to fraction form
   71,403.55/107,002.72 = 40,172.83/x
3. Step 3: Cross multiply
   71,403.55x = 107,002.72 × 40,172.83
4. Step 4: Simplify right side
   71,403.55x = 4,298,602,080.10
5. Step 5: Solve for x
   x = 4,298,602,080.10/71,403.55
6. Step 6: Final answer
   x = 60,201.52