Finding the Fourth Proportional to 12,650.50, 18,978.18 and 5,725

Step by Step Solution

1. Step 1: Write the proportion equation
   12,650.50 : 18,978.18 = 5,725 : x
2. Step 2: Convert to fraction form
   12,650.50/18,978.18 = 5,725/x
3. Step 3: Cross multiply
   12,650.50x = 18,978.18 × 5,725
4. Step 4: Simplify right side
   12,650.50x = 108,650,080.50
5. Step 5: Solve for x
   x = 108,650,080.50/12,650.50
6. Step 6: Final answer
   x = 8,588.60