Finding the Fourth Proportional to 1,042.31, 1,434.72 and 943.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.31 : 1,434.72 = 943.89 : x
2. Step 2: Convert to fraction form
   1,042.31/1,434.72 = 943.89/x
3. Step 3: Cross multiply
   1,042.31x = 1,434.72 × 943.89
4. Step 4: Simplify right side
   1,042.31x = 1,354,217.86
5. Step 5: Solve for x
   x = 1,354,217.86/1,042.31
6. Step 6: Final answer
   x = 1,299.25