Finding the Fourth Proportional to 1,274.61, 1,910.83 and 689.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,274.61 : 1,910.83 = 689.25 : x
2. Step 2: Convert to fraction form
   1,274.61/1,910.83 = 689.25/x
3. Step 3: Cross multiply
   1,274.61x = 1,910.83 × 689.25
4. Step 4: Simplify right side
   1,274.61x = 1,317,028.30
5. Step 5: Solve for x
   x = 1,317,028.30/1,274.61
6. Step 6: Final answer
   x = 1,033.28