Finding the Fourth Proportional to 1,276.42, 1,761.46 and 716.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.42 : 1,761.46 = 716.89 : x
2. Step 2: Convert to fraction form
   1,276.42/1,761.46 = 716.89/x
3. Step 3: Cross multiply
   1,276.42x = 1,761.46 × 716.89
4. Step 4: Simplify right side
   1,276.42x = 1,262,773.06
5. Step 5: Solve for x
   x = 1,262,773.06/1,276.42
6. Step 6: Final answer
   x = 989.31