Finding the Fourth Proportional to 12,513.72, 17,248.90 and 8,479.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,513.72 : 17,248.90 = 8,479.32 : x
2. Step 2: Convert to fraction form
   12,513.72/17,248.90 = 8,479.32/x
3. Step 3: Cross multiply
   12,513.72x = 17,248.90 × 8,479.32
4. Step 4: Simplify right side
   12,513.72x = 146,258,942.75
5. Step 5: Solve for x
   x = 146,258,942.75/12,513.72
6. Step 6: Final answer
   x = 11,687.89