Finding the Fourth Proportional to 1,287.72, 1,930.10 and 702.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.72 : 1,930.10 = 702.27 : x
2. Step 2: Convert to fraction form
   1,287.72/1,930.10 = 702.27/x
3. Step 3: Cross multiply
   1,287.72x = 1,930.10 × 702.27
4. Step 4: Simplify right side
   1,287.72x = 1,355,447.82
5. Step 5: Solve for x
   x = 1,355,447.82/1,287.72
6. Step 6: Final answer
   x = 1,052.60