Finding the Fourth Proportional to 1,100.25, 1,648.04 and 688.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.25 : 1,648.04 = 688.91 : x
2. Step 2: Convert to fraction form
   1,100.25/1,648.04 = 688.91/x
3. Step 3: Cross multiply
   1,100.25x = 1,648.04 × 688.91
4. Step 4: Simplify right side
   1,100.25x = 1,135,339.55
5. Step 5: Solve for x
   x = 1,135,339.55/1,100.25
6. Step 6: Final answer
   x = 1,031.89