Finding the Fourth Proportional to 12,311.80, 18,350.72 and 11,611.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,311.80 : 18,350.72 = 11,611.25 : x
2. Step 2: Convert to fraction form
   12,311.80/18,350.72 = 11,611.25/x
3. Step 3: Cross multiply
   12,311.80x = 18,350.72 × 11,611.25
4. Step 4: Simplify right side
   12,311.80x = 213,074,760.15
5. Step 5: Solve for x
   x = 213,074,760.15/12,311.80
6. Step 6: Final answer
   x = 17,306.55