Finding the Fourth Proportional to 1,086.40, 1,499.68 and 693.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.40 : 1,499.68 = 693.44 : x
2. Step 2: Convert to fraction form
   1,086.40/1,499.68 = 693.44/x
3. Step 3: Cross multiply
   1,086.40x = 1,499.68 × 693.44
4. Step 4: Simplify right side
   1,086.40x = 1,039,938.10
5. Step 5: Solve for x
   x = 1,039,938.10/1,086.40
6. Step 6: Final answer
   x = 957.23