Finding the Fourth Proportional to 1,728.72, 2,588.04 and 905.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728.72 : 2,588.04 = 905.04 : x
2. Step 2: Convert to fraction form
   1,728.72/2,588.04 = 905.04/x
3. Step 3: Cross multiply
   1,728.72x = 2,588.04 × 905.04
4. Step 4: Simplify right side
   1,728.72x = 2,342,279.72
5. Step 5: Solve for x
   x = 2,342,279.72/1,728.72
6. Step 6: Final answer
   x = 1,354.92