Finding the Fourth Proportional to 12,613.61, 17,406.79 and 7,311.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,613.61 : 17,406.79 = 7,311.50 : x
2. Step 2: Convert to fraction form
   12,613.61/17,406.79 = 7,311.50/x
3. Step 3: Cross multiply
   12,613.61x = 17,406.79 × 7,311.50
4. Step 4: Simplify right side
   12,613.61x = 127,269,752.04
5. Step 5: Solve for x
   x = 127,269,752.04/12,613.61
6. Step 6: Final answer
   x = 10,089.88