Finding the Fourth Proportional to 1,787.47, 2,680.53 and 862.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,787.47 : 2,680.53 = 862.72 : x
2. Step 2: Convert to fraction form
   1,787.47/2,680.53 = 862.72/x
3. Step 3: Cross multiply
   1,787.47x = 2,680.53 × 862.72
4. Step 4: Simplify right side
   1,787.47x = 2,312,546.84
5. Step 5: Solve for x
   x = 2,312,546.84/1,787.47
6. Step 6: Final answer
   x = 1,293.75