Finding the Fourth Proportional to 71,916.29, 99,247.85 and 40,085.42

Step by Step Solution

1. Step 1: Write the proportion equation
   71,916.29 : 99,247.85 = 40,085.42 : x
2. Step 2: Convert to fraction form
   71,916.29/99,247.85 = 40,085.42/x
3. Step 3: Cross multiply
   71,916.29x = 99,247.85 × 40,085.42
4. Step 4: Simplify right side
   71,916.29x = 3,978,391,205.00
5. Step 5: Solve for x
   x = 3,978,391,205.00/71,916.29
6. Step 6: Final answer
   x = 55,319.75