Finding the Fourth Proportional to 1,213.29, 1,674.59 and 689.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,213.29 : 1,674.59 = 689.49 : x
2. Step 2: Convert to fraction form
   1,213.29/1,674.59 = 689.49/x
3. Step 3: Cross multiply
   1,213.29x = 1,674.59 × 689.49
4. Step 4: Simplify right side
   1,213.29x = 1,154,609.61
5. Step 5: Solve for x
   x = 1,154,609.61/1,213.29
6. Step 6: Final answer
   x = 951.64