Finding the Fourth Proportional to 1,728.72, 2,590.65 and 1,296.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728.72 : 2,590.65 = 1,296.18 : x
2. Step 2: Convert to fraction form
   1,728.72/2,590.65 = 1,296.18/x
3. Step 3: Cross multiply
   1,728.72x = 2,590.65 × 1,296.18
4. Step 4: Simplify right side
   1,728.72x = 3,357,948.72
5. Step 5: Solve for x
   x = 3,357,948.72/1,728.72
6. Step 6: Final answer
   x = 1,942.45