Finding the Fourth Proportional to 2,311.42, 3,188.82 and 1,613.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.42 : 3,188.82 = 1,613.20 : x
2. Step 2: Convert to fraction form
   2,311.42/3,188.82 = 1,613.20/x
3. Step 3: Cross multiply
   2,311.42x = 3,188.82 × 1,613.20
4. Step 4: Simplify right side
   2,311.42x = 5,144,204.42
5. Step 5: Solve for x
   x = 5,144,204.42/2,311.42
6. Step 6: Final answer
   x = 2,225.56