Finding the Fourth Proportional to 1,291.72, 1,782.56 and 702.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,291.72 : 1,782.56 = 702.25 : x
2. Step 2: Convert to fraction form
   1,291.72/1,782.56 = 702.25/x
3. Step 3: Cross multiply
   1,291.72x = 1,782.56 × 702.25
4. Step 4: Simplify right side
   1,291.72x = 1,251,802.76
5. Step 5: Solve for x
   x = 1,251,802.76/1,291.72
6. Step 6: Final answer
   x = 969.10