Finding the Fourth Proportional to 1,233.78, 1,702.59 and 709.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,233.78 : 1,702.59 = 709.92 : x
2. Step 2: Convert to fraction form
   1,233.78/1,702.59 = 709.92/x
3. Step 3: Cross multiply
   1,233.78x = 1,702.59 × 709.92
4. Step 4: Simplify right side
   1,233.78x = 1,208,702.69
5. Step 5: Solve for x
   x = 1,208,702.69/1,233.78
6. Step 6: Final answer
   x = 979.67