Finding the Fourth Proportional to 12,631.50, 17,431.47 and 7,042.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,631.50 : 17,431.47 = 7,042.50 : x
2. Step 2: Convert to fraction form
   12,631.50/17,431.47 = 7,042.50/x
3. Step 3: Cross multiply
   12,631.50x = 17,431.47 × 7,042.50
4. Step 4: Simplify right side
   12,631.50x = 122,761,127.48
5. Step 5: Solve for x
   x = 122,761,127.48/12,631.50
6. Step 6: Final answer
   x = 9,718.65