Finding the Fourth Proportional to 71,983.78, 99,339.72 and 40,151.99

Step by Step Solution

1. Step 1: Write the proportion equation
   71,983.78 : 99,339.72 = 40,151.99 : x
2. Step 2: Convert to fraction form
   71,983.78/99,339.72 = 40,151.99/x
3. Step 3: Cross multiply
   71,983.78x = 99,339.72 × 40,151.99
4. Step 4: Simplify right side
   71,983.78x = 3,988,687,444.04
5. Step 5: Solve for x
   x = 3,988,687,444.04/71,983.78
6. Step 6: Final answer
   x = 55,410.92