Finding the Fourth Proportional to 1,256.30, 1,733.50 and 717.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,256.30 : 1,733.50 = 717.89 : x
2. Step 2: Convert to fraction form
   1,256.30/1,733.50 = 717.89/x
3. Step 3: Cross multiply
   1,256.30x = 1,733.50 × 717.89
4. Step 4: Simplify right side
   1,256.30x = 1,244,467.55
5. Step 5: Solve for x
   x = 1,244,467.55/1,256.30
6. Step 6: Final answer
   x = 990.59