Finding the Fourth Proportional to 12,613.24, 17,280.23 and 12,140.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,613.24 : 17,280.23 = 12,140.30 : x
2. Step 2: Convert to fraction form
   12,613.24/17,280.23 = 12,140.30/x
3. Step 3: Cross multiply
   12,613.24x = 17,280.23 × 12,140.30
4. Step 4: Simplify right side
   12,613.24x = 209,787,158.77
5. Step 5: Solve for x
   x = 209,787,158.77/12,613.24
6. Step 6: Final answer
   x = 16,632.30