Finding the Fourth Proportional to 71,916.79, 99,248.54 and 40,085.92

Step by Step Solution

1. Step 1: Write the proportion equation
   71,916.79 : 99,248.54 = 40,085.92 : x
2. Step 2: Convert to fraction form
   71,916.79/99,248.54 = 40,085.92/x
3. Step 3: Cross multiply
   71,916.79x = 99,248.54 × 40,085.92
4. Step 4: Simplify right side
   71,916.79x = 3,978,468,538.31
5. Step 5: Solve for x
   x = 3,978,468,538.31/71,916.79
6. Step 6: Final answer
   x = 55,320.44