Finding the Fourth Proportional to 1,552.16, 2,142.24 and 931.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,552.16 : 2,142.24 = 931.28 : x
2. Step 2: Convert to fraction form
   1,552.16/2,142.24 = 931.28/x
3. Step 3: Cross multiply
   1,552.16x = 2,142.24 × 931.28
4. Step 4: Simplify right side
   1,552.16x = 1,995,025.27
5. Step 5: Solve for x
   x = 1,995,025.27/1,552.16
6. Step 6: Final answer
   x = 1,285.32