Finding the Fourth Proportional to 12,311.88, 16,990.40 and 7,596.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,311.88 : 16,990.40 = 7,596.16 : x
2. Step 2: Convert to fraction form
   12,311.88/16,990.40 = 7,596.16/x
3. Step 3: Cross multiply
   12,311.88x = 16,990.40 × 7,596.16
4. Step 4: Simplify right side
   12,311.88x = 129,061,796.86
5. Step 5: Solve for x
   x = 129,061,796.86/12,311.88
6. Step 6: Final answer
   x = 10,482.70