Finding the Fourth Proportional to 42,651.18, 63,986.13 and 13,071.24

Step by Step Solution

1. Step 1: Write the proportion equation
   42,651.18 : 63,986.13 = 13,071.24 : x
2. Step 2: Convert to fraction form
   42,651.18/63,986.13 = 13,071.24/x
3. Step 3: Cross multiply
   42,651.18x = 63,986.13 × 13,071.24
4. Step 4: Simplify right side
   42,651.18x = 836,378,061.90
5. Step 5: Solve for x
   x = 836,378,061.90/42,651.18
6. Step 6: Final answer
   x = 19,609.73