Finding the Fourth Proportional to 12,664.50, 18,999.18 and 5,739

Step by Step Solution

1. Step 1: Write the proportion equation
   12,664.50 : 18,999.18 = 5,739 : x
2. Step 2: Convert to fraction form
   12,664.50/18,999.18 = 5,739/x
3. Step 3: Cross multiply
   12,664.50x = 18,999.18 × 5,739
4. Step 4: Simplify right side
   12,664.50x = 109,036,294.02
5. Step 5: Solve for x
   x = 109,036,294.02/12,664.50
6. Step 6: Final answer
   x = 8,609.60