Finding the Fourth Proportional to 2,561.31, 3,534.47 and 1,442.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.31 : 3,534.47 = 1,442.21 : x
2. Step 2: Convert to fraction form
   2,561.31/3,534.47 = 1,442.21/x
3. Step 3: Cross multiply
   2,561.31x = 3,534.47 × 1,442.21
4. Step 4: Simplify right side
   2,561.31x = 5,097,423.10
5. Step 5: Solve for x
   x = 5,097,423.10/2,561.31
6. Step 6: Final answer
   x = 1,990.16