Finding the Fourth Proportional to 1,728.89, 2,385.10 and 1,169.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728.89 : 2,385.10 = 1,169.15 : x
2. Step 2: Convert to fraction form
   1,728.89/2,385.10 = 1,169.15/x
3. Step 3: Cross multiply
   1,728.89x = 2,385.10 × 1,169.15
4. Step 4: Simplify right side
   1,728.89x = 2,788,539.67
5. Step 5: Solve for x
   x = 2,788,539.67/1,728.89
6. Step 6: Final answer
   x = 1,612.91