Finding the Fourth Proportional to 1,276.89, 1,762.04 and 717.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.89 : 1,762.04 = 717.38 : x
2. Step 2: Convert to fraction form
   1,276.89/1,762.04 = 717.38/x
3. Step 3: Cross multiply
   1,276.89x = 1,762.04 × 717.38
4. Step 4: Simplify right side
   1,276.89x = 1,264,050.46
5. Step 5: Solve for x
   x = 1,264,050.46/1,276.89
6. Step 6: Final answer
   x = 989.95