Finding the Fourth Proportional to 1,725.12, 2,582.10 and 1,231.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,725.12 : 2,582.10 = 1,231.20 : x
2. Step 2: Convert to fraction form
   1,725.12/2,582.10 = 1,231.20/x
3. Step 3: Cross multiply
   1,725.12x = 2,582.10 × 1,231.20
4. Step 4: Simplify right side
   1,725.12x = 3,179,081.52
5. Step 5: Solve for x
   x = 3,179,081.52/1,725.12
6. Step 6: Final answer
   x = 1,842.82