Finding the Fourth Proportional to 1,291.43, 1,782.15 and 731.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,291.43 : 1,782.15 = 731.89 : x
2. Step 2: Convert to fraction form
   1,291.43/1,782.15 = 731.89/x
3. Step 3: Cross multiply
   1,291.43x = 1,782.15 × 731.89
4. Step 4: Simplify right side
   1,291.43x = 1,304,337.76
5. Step 5: Solve for x
   x = 1,304,337.76/1,291.43
6. Step 6: Final answer
   x = 1,009.99