Finding the Fourth Proportional to 12,989.52, 17,928.52 and 7,614.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,989.52 : 17,928.52 = 7,614.40 : x
2. Step 2: Convert to fraction form
   12,989.52/17,928.52 = 7,614.40/x
3. Step 3: Cross multiply
   12,989.52x = 17,928.52 × 7,614.40
4. Step 4: Simplify right side
   12,989.52x = 136,514,922.69
5. Step 5: Solve for x
   x = 136,514,922.69/12,989.52
6. Step 6: Final answer
   x = 10,509.62