Finding the Fourth Proportional to 1,085.10, 1,626.58 and 689.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.10 : 1,626.58 = 689.98 : x
2. Step 2: Convert to fraction form
   1,085.10/1,626.58 = 689.98/x
3. Step 3: Cross multiply
   1,085.10x = 1,626.58 × 689.98
4. Step 4: Simplify right side
   1,085.10x = 1,122,307.67
5. Step 5: Solve for x
   x = 1,122,307.67/1,085.10
6. Step 6: Final answer
   x = 1,034.29