Finding the Fourth Proportional to 42,012.48, 63,031.08 and 12,431.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,012.48 : 63,031.08 = 12,431.10 : x
2. Step 2: Convert to fraction form
   42,012.48/63,031.08 = 12,431.10/x
3. Step 3: Cross multiply
   42,012.48x = 63,031.08 × 12,431.10
4. Step 4: Simplify right side
   42,012.48x = 783,545,658.59
5. Step 5: Solve for x
   x = 783,545,658.59/42,012.48
6. Step 6: Final answer
   x = 18,650.31