Finding the Fourth Proportional to 1,275.40, 1,760.01 and 715.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.40 : 1,760.01 = 715.91 : x
2. Step 2: Convert to fraction form
   1,275.40/1,760.01 = 715.91/x
3. Step 3: Cross multiply
   1,275.40x = 1,760.01 × 715.91
4. Step 4: Simplify right side
   1,275.40x = 1,259,997.27
5. Step 5: Solve for x
   x = 1,259,997.27/1,275.40
6. Step 6: Final answer
   x = 987.92