Finding the Fourth Proportional to 17,666.64, 24,401.34 and 12,879

Step by Step Solution

1. Step 1: Write the proportion equation
   17,666.64 : 24,401.34 = 12,879 : x
2. Step 2: Convert to fraction form
   17,666.64/24,401.34 = 12,879/x
3. Step 3: Cross multiply
   17,666.64x = 24,401.34 × 12,879
4. Step 4: Simplify right side
   17,666.64x = 314,264,857.86
5. Step 5: Solve for x
   x = 314,264,857.86/17,666.64
6. Step 6: Final answer
   x = 17,788.60