Finding the Fourth Proportional to 1,540.72, 2,311.56 and 1,418.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540.72 : 2,311.56 = 1,418.56 : x
2. Step 2: Convert to fraction form
   1,540.72/2,311.56 = 1,418.56/x
3. Step 3: Cross multiply
   1,540.72x = 2,311.56 × 1,418.56
4. Step 4: Simplify right side
   1,540.72x = 3,279,086.55
5. Step 5: Solve for x
   x = 3,279,086.55/1,540.72
6. Step 6: Final answer
   x = 2,128.28