Finding the Fourth Proportional to 1,249.83, 1,724.69 and 718.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,249.83 : 1,724.69 = 718.35 : x
2. Step 2: Convert to fraction form
   1,249.83/1,724.69 = 718.35/x
3. Step 3: Cross multiply
   1,249.83x = 1,724.69 × 718.35
4. Step 4: Simplify right side
   1,249.83x = 1,238,931.06
5. Step 5: Solve for x
   x = 1,238,931.06/1,249.83
6. Step 6: Final answer
   x = 991.28