Finding the Fourth Proportional to 1,086.90, 1,499.56 and 694.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.90 : 1,499.56 = 694.15 : x
2. Step 2: Convert to fraction form
   1,086.90/1,499.56 = 694.15/x
3. Step 3: Cross multiply
   1,086.90x = 1,499.56 × 694.15
4. Step 4: Simplify right side
   1,086.90x = 1,040,916.10
5. Step 5: Solve for x
   x = 1,040,916.10/1,086.90
6. Step 6: Final answer
   x = 957.69