Finding the Fourth Proportional to 1,348.72, 2,022.12 and 690.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.72 : 2,022.12 = 690.79 : x
2. Step 2: Convert to fraction form
   1,348.72/2,022.12 = 690.79/x
3. Step 3: Cross multiply
   1,348.72x = 2,022.12 × 690.79
4. Step 4: Simplify right side
   1,348.72x = 1,396,860.27
5. Step 5: Solve for x
   x = 1,396,860.27/1,348.72
6. Step 6: Final answer
   x = 1,035.69