Finding the Fourth Proportional to 12,731.50, 17,570.82 and 7,142.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,731.50 : 17,570.82 = 7,142.50 : x
2. Step 2: Convert to fraction form
   12,731.50/17,570.82 = 7,142.50/x
3. Step 3: Cross multiply
   12,731.50x = 17,570.82 × 7,142.50
4. Step 4: Simplify right side
   12,731.50x = 125,499,581.85
5. Step 5: Solve for x
   x = 125,499,581.85/12,731.50
6. Step 6: Final answer
   x = 9,857.41