Finding the Fourth Proportional to 12,939.62, 17,849.67 and 10,688.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,939.62 : 17,849.67 = 10,688.18 : x
2. Step 2: Convert to fraction form
   12,939.62/17,849.67 = 10,688.18/x
3. Step 3: Cross multiply
   12,939.62x = 17,849.67 × 10,688.18
4. Step 4: Simplify right side
   12,939.62x = 190,780,485.90
5. Step 5: Solve for x
   x = 190,780,485.90/12,939.62
6. Step 6: Final answer
   x = 14,743.90