Finding the Fourth Proportional to 1,728.14, 2,587.86 and 1,111.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728.14 : 2,587.86 = 1,111.91 : x
2. Step 2: Convert to fraction form
   1,728.14/2,587.86 = 1,111.91/x
3. Step 3: Cross multiply
   1,728.14x = 2,587.86 × 1,111.91
4. Step 4: Simplify right side
   1,728.14x = 2,877,454.47
5. Step 5: Solve for x
   x = 2,877,454.47/1,728.14
6. Step 6: Final answer
   x = 1,665.06