Finding the Fourth Proportional to 1,552.43, 2,142.89 and 931.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,552.43 : 2,142.89 = 931.43 : x
2. Step 2: Convert to fraction form
   1,552.43/2,142.89 = 931.43/x
3. Step 3: Cross multiply
   1,552.43x = 2,142.89 × 931.43
4. Step 4: Simplify right side
   1,552.43x = 1,995,936.66
5. Step 5: Solve for x
   x = 1,995,936.66/1,552.43
6. Step 6: Final answer
   x = 1,285.69