Finding the Fourth Proportional to 1,081.85, 1,493.17 and 688.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.85 : 1,493.17 = 688.79 : x
2. Step 2: Convert to fraction form
   1,081.85/1,493.17 = 688.79/x
3. Step 3: Cross multiply
   1,081.85x = 1,493.17 × 688.79
4. Step 4: Simplify right side
   1,081.85x = 1,028,482.58
5. Step 5: Solve for x
   x = 1,028,482.58/1,081.85
6. Step 6: Final answer
   x = 950.67