Finding the Fourth Proportional to 738.72, 1,100.79 and 690.12

Step by Step Solution

1. Step 1: Write the proportion equation
   738.72 : 1,100.79 = 690.12 : x
2. Step 2: Convert to fraction form
   738.72/1,100.79 = 690.12/x
3. Step 3: Cross multiply
   738.72x = 1,100.79 × 690.12
4. Step 4: Simplify right side
   738.72x = 759,677.19
5. Step 5: Solve for x
   x = 759,677.19/738.72
6. Step 6: Final answer
   x = 1,028.37