Finding the Fourth Proportional to 1,287.72, 1,930.71 and 702.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.72 : 1,930.71 = 702.24 : x
2. Step 2: Convert to fraction form
   1,287.72/1,930.71 = 702.24/x
3. Step 3: Cross multiply
   1,287.72x = 1,930.71 × 702.24
4. Step 4: Simplify right side
   1,287.72x = 1,355,831.50
5. Step 5: Solve for x
   x = 1,355,831.50/1,287.72
6. Step 6: Final answer
   x = 1,052.89