Finding the Fourth Proportional to 71,987, 99,342.15 and 40,157.93

Step by Step Solution

1. Step 1: Write the proportion equation
   71,987 : 99,342.15 = 40,157.93 : x
2. Step 2: Convert to fraction form
   71,987/99,342.15 = 40,157.93/x
3. Step 3: Cross multiply
   71,987x = 99,342.15 × 40,157.93
4. Step 4: Simplify right side
   71,987x = 3,989,375,105.75
5. Step 5: Solve for x
   x = 3,989,375,105.75/71,987
6. Step 6: Final answer
   x = 55,417.99