Finding the Fourth Proportional to 1,561.24, 2,154.90 and 1,142.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.24 : 2,154.90 = 1,142.20 : x
2. Step 2: Convert to fraction form
   1,561.24/2,154.90 = 1,142.20/x
3. Step 3: Cross multiply
   1,561.24x = 2,154.90 × 1,142.20
4. Step 4: Simplify right side
   1,561.24x = 2,461,326.78
5. Step 5: Solve for x
   x = 2,461,326.78/1,561.24
6. Step 6: Final answer
   x = 1,576.52