Finding the Fourth Proportional to 1,787.89, 2,680.28 and 864.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,787.89 : 2,680.28 = 864.09 : x
2. Step 2: Convert to fraction form
   1,787.89/2,680.28 = 864.09/x
3. Step 3: Cross multiply
   1,787.89x = 2,680.28 × 864.09
4. Step 4: Simplify right side
   1,787.89x = 2,316,003.15
5. Step 5: Solve for x
   x = 2,316,003.15/1,787.89
6. Step 6: Final answer
   x = 1,295.38