Finding the Fourth Proportional to 1,647.20, 2,471.04 and 722.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,647.20 : 2,471.04 = 722.72 : x
2. Step 2: Convert to fraction form
   1,647.20/2,471.04 = 722.72/x
3. Step 3: Cross multiply
   1,647.20x = 2,471.04 × 722.72
4. Step 4: Simplify right side
   1,647.20x = 1,785,870.03
5. Step 5: Solve for x
   x = 1,785,870.03/1,647.20
6. Step 6: Final answer
   x = 1,084.19