Finding the Fourth Proportional to 1,275.71, 1,760.56 and 716.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.71 : 1,760.56 = 716.21 : x
2. Step 2: Convert to fraction form
   1,275.71/1,760.56 = 716.21/x
3. Step 3: Cross multiply
   1,275.71x = 1,760.56 × 716.21
4. Step 4: Simplify right side
   1,275.71x = 1,260,936.59
5. Step 5: Solve for x
   x = 1,260,936.59/1,275.71
6. Step 6: Final answer
   x = 988.42