Finding the Fourth Proportional to 2,540.28, 3,505.57 and 1,421.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,540.28 : 3,505.57 = 1,421.34 : x
2. Step 2: Convert to fraction form
   2,540.28/3,505.57 = 1,421.34/x
3. Step 3: Cross multiply
   2,540.28x = 3,505.57 × 1,421.34
4. Step 4: Simplify right side
   2,540.28x = 4,982,606.86
5. Step 5: Solve for x
   x = 4,982,606.86/2,540.28
6. Step 6: Final answer
   x = 1,961.44