Finding the Fourth Proportional to 1,291.83, 1,782.72 and 724.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,291.83 : 1,782.72 = 724.68 : x
2. Step 2: Convert to fraction form
   1,291.83/1,782.72 = 724.68/x
3. Step 3: Cross multiply
   1,291.83x = 1,782.72 × 724.68
4. Step 4: Simplify right side
   1,291.83x = 1,291,901.53
5. Step 5: Solve for x
   x = 1,291,901.53/1,291.83
6. Step 6: Final answer
   x = 1,000.06