Finding the Fourth Proportional to 71,843.10, 99,143.37 and 40,014.78

Step by Step Solution

1. Step 1: Write the proportion equation
   71,843.10 : 99,143.37 = 40,014.78 : x
2. Step 2: Convert to fraction form
   71,843.10/99,143.37 = 40,014.78/x
3. Step 3: Cross multiply
   71,843.10x = 99,143.37 × 40,014.78
4. Step 4: Simplify right side
   71,843.10x = 3,967,200,139.01
5. Step 5: Solve for x
   x = 3,967,200,139.01/71,843.10
6. Step 6: Final answer
   x = 55,220.34