Finding the Fourth Proportional to 71,930.57, 99,268.53 and 40,099.37

Step by Step Solution

1. Step 1: Write the proportion equation
   71,930.57 : 99,268.53 = 40,099.37 : x
2. Step 2: Convert to fraction form
   71,930.57/99,268.53 = 40,099.37/x
3. Step 3: Cross multiply
   71,930.57x = 99,268.53 × 40,099.37
4. Step 4: Simplify right side
   71,930.57x = 3,980,605,513.83
5. Step 5: Solve for x
   x = 3,980,605,513.83/71,930.57
6. Step 6: Final answer
   x = 55,339.55