Finding the Fourth Proportional to 1,275.29, 1,759.82 and 715.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.29 : 1,759.82 = 715.76 : x
2. Step 2: Convert to fraction form
   1,275.29/1,759.82 = 715.76/x
3. Step 3: Cross multiply
   1,275.29x = 1,759.82 × 715.76
4. Step 4: Simplify right side
   1,275.29x = 1,259,596.39
5. Step 5: Solve for x
   x = 1,259,596.39/1,275.29
6. Step 6: Final answer
   x = 987.69