Finding the Fourth Proportional to 12,788.52, 17,643.92 and 7,479.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,788.52 : 17,643.92 = 7,479.57 : x
2. Step 2: Convert to fraction form
   12,788.52/17,643.92 = 7,479.57/x
3. Step 3: Cross multiply
   12,788.52x = 17,643.92 × 7,479.57
4. Step 4: Simplify right side
   12,788.52x = 131,968,934.71
5. Step 5: Solve for x
   x = 131,968,934.71/12,788.52
6. Step 6: Final answer
   x = 10,319.33