Finding the Fourth Proportional to 12,487.31, 17,231.51 and 7,182.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,487.31 : 17,231.51 = 7,182.47 : x
2. Step 2: Convert to fraction form
   12,487.31/17,231.51 = 7,182.47/x
3. Step 3: Cross multiply
   12,487.31x = 17,231.51 × 7,182.47
4. Step 4: Simplify right side
   12,487.31x = 123,764,844.46
5. Step 5: Solve for x
   x = 123,764,844.46/12,487.31
6. Step 6: Final answer
   x = 9,911.25