Finding the Fourth Proportional to 71,991.91, 99,348.69 and 40,158.91

Step by Step Solution

1. Step 1: Write the proportion equation
   71,991.91 : 99,348.69 = 40,158.91 : x
2. Step 2: Convert to fraction form
   71,991.91/99,348.69 = 40,158.91/x
3. Step 3: Cross multiply
   71,991.91x = 99,348.69 × 40,158.91
4. Step 4: Simplify right side
   71,991.91x = 3,989,735,100.33
5. Step 5: Solve for x
   x = 3,989,735,100.33/71,991.91
6. Step 6: Final answer
   x = 55,419.21