Finding the Fourth Proportional to 1,275.57, 1,760.31 and 716.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.57 : 1,760.31 = 716.07 : x
2. Step 2: Convert to fraction form
   1,275.57/1,760.31 = 716.07/x
3. Step 3: Cross multiply
   1,275.57x = 1,760.31 × 716.07
4. Step 4: Simplify right side
   1,275.57x = 1,260,505.18
5. Step 5: Solve for x
   x = 1,260,505.18/1,275.57
6. Step 6: Final answer
   x = 988.19