Finding the Fourth Proportional to 1,121.72, 1,548.59 and 702.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,121.72 : 1,548.59 = 702.47 : x
2. Step 2: Convert to fraction form
   1,121.72/1,548.59 = 702.47/x
3. Step 3: Cross multiply
   1,121.72x = 1,548.59 × 702.47
4. Step 4: Simplify right side
   1,121.72x = 1,087,838.38
5. Step 5: Solve for x
   x = 1,087,838.38/1,121.72
6. Step 6: Final answer
   x = 969.80