Finding the Fourth Proportional to 1,142.56, 1,576.02 and 921.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.56 : 1,576.02 = 921.52 : x
2. Step 2: Convert to fraction form
   1,142.56/1,576.02 = 921.52/x
3. Step 3: Cross multiply
   1,142.56x = 1,576.02 × 921.52
4. Step 4: Simplify right side
   1,142.56x = 1,452,333.95
5. Step 5: Solve for x
   x = 1,452,333.95/1,142.56
6. Step 6: Final answer
   x = 1,271.12