Finding the Fourth Proportional to 1,275.83, 1,760.59 and 716.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.83 : 1,760.59 = 716.39 : x
2. Step 2: Convert to fraction form
   1,275.83/1,760.59 = 716.39/x
3. Step 3: Cross multiply
   1,275.83x = 1,760.59 × 716.39
4. Step 4: Simplify right side
   1,275.83x = 1,261,269.07
5. Step 5: Solve for x
   x = 1,261,269.07/1,275.83
6. Step 6: Final answer
   x = 988.59