Finding the Fourth Proportional to 12,432, 17,145.72 and 7,713.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,432 : 17,145.72 = 7,713.12 : x
2. Step 2: Convert to fraction form
   12,432/17,145.72 = 7,713.12/x
3. Step 3: Cross multiply
   12,432x = 17,145.72 × 7,713.12
4. Step 4: Simplify right side
   12,432x = 132,246,995.85
5. Step 5: Solve for x
   x = 132,246,995.85/12,432
6. Step 6: Final answer
   x = 10,637.63