Finding the Fourth Proportional to 71,820, 99,123.12 and 42,006.24

Step by Step Solution

1. Step 1: Write the proportion equation
   71,820 : 99,123.12 = 42,006.24 : x
2. Step 2: Convert to fraction form
   71,820/99,123.12 = 42,006.24/x
3. Step 3: Cross multiply
   71,820x = 99,123.12 × 42,006.24
4. Step 4: Simplify right side
   71,820x = 4,163,789,568.27
5. Step 5: Solve for x
   x = 4,163,789,568.27/71,820
6. Step 6: Final answer
   x = 57,975.35