Finding the Fourth Proportional to 1,382.40, 2,072.16 and 725.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.40 : 2,072.16 = 725.04 : x
2. Step 2: Convert to fraction form
   1,382.40/2,072.16 = 725.04/x
3. Step 3: Cross multiply
   1,382.40x = 2,072.16 × 725.04
4. Step 4: Simplify right side
   1,382.40x = 1,502,398.89
5. Step 5: Solve for x
   x = 1,502,398.89/1,382.40
6. Step 6: Final answer
   x = 1,086.80