Finding the Fourth Proportional to 1,478.29, 2,217.89 and 656.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.29 : 2,217.89 = 656.49 : x
2. Step 2: Convert to fraction form
   1,478.29/2,217.89 = 656.49/x
3. Step 3: Cross multiply
   1,478.29x = 2,217.89 × 656.49
4. Step 4: Simplify right side
   1,478.29x = 1,456,019.32
5. Step 5: Solve for x
   x = 1,456,019.32/1,478.29
6. Step 6: Final answer
   x = 984.94