Finding the Fourth Proportional to 2,540.16, 3,505.59 and 1,421.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,540.16 : 3,505.59 = 1,421.10 : x
2. Step 2: Convert to fraction form
   2,540.16/3,505.59 = 1,421.10/x
3. Step 3: Cross multiply
   2,540.16x = 3,505.59 × 1,421.10
4. Step 4: Simplify right side
   2,540.16x = 4,981,793.95
5. Step 5: Solve for x
   x = 4,981,793.95/2,540.16
6. Step 6: Final answer
   x = 1,961.21