Finding the Fourth Proportional to 1,091.79, 1,638.35 and 702.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.79 : 1,638.35 = 702.04 : x
2. Step 2: Convert to fraction form
   1,091.79/1,638.35 = 702.04/x
3. Step 3: Cross multiply
   1,091.79x = 1,638.35 × 702.04
4. Step 4: Simplify right side
   1,091.79x = 1,150,181.82
5. Step 5: Solve for x
   x = 1,150,181.82/1,091.79
6. Step 6: Final answer
   x = 1,053.49