Finding the Fourth Proportional to 1,727.72, 2,383.95 and 1,640.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,727.72 : 2,383.95 = 1,640.15 : x
2. Step 2: Convert to fraction form
   1,727.72/2,383.95 = 1,640.15/x
3. Step 3: Cross multiply
   1,727.72x = 2,383.95 × 1,640.15
4. Step 4: Simplify right side
   1,727.72x = 3,910,023.67
5. Step 5: Solve for x
   x = 3,910,023.67/1,727.72
6. Step 6: Final answer
   x = 2,263.12