Finding the Fourth Proportional to 1,275.42, 1,760.08 and 715.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.42 : 1,760.08 = 715.89 : x
2. Step 2: Convert to fraction form
   1,275.42/1,760.08 = 715.89/x
3. Step 3: Cross multiply
   1,275.42x = 1,760.08 × 715.89
4. Step 4: Simplify right side
   1,275.42x = 1,260,022.55
5. Step 5: Solve for x
   x = 1,260,022.55/1,275.42
6. Step 6: Final answer
   x = 987.93