Finding the Fourth Proportional to 1,728.72, 2,385.33 and 1,641.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728.72 : 2,385.33 = 1,641.15 : x
2. Step 2: Convert to fraction form
   1,728.72/2,385.33 = 1,641.15/x
3. Step 3: Cross multiply
   1,728.72x = 2,385.33 × 1,641.15
4. Step 4: Simplify right side
   1,728.72x = 3,914,684.33
5. Step 5: Solve for x
   x = 3,914,684.33/1,728.72
6. Step 6: Final answer
   x = 2,264.50