Finding the Fourth Proportional to 1,787.52, 2,680.56 and 921.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,787.52 : 2,680.56 = 921.36 : x
2. Step 2: Convert to fraction form
   1,787.52/2,680.56 = 921.36/x
3. Step 3: Cross multiply
   1,787.52x = 2,680.56 × 921.36
4. Step 4: Simplify right side
   1,787.52x = 2,469,760.76
5. Step 5: Solve for x
   x = 2,469,760.76/1,787.52
6. Step 6: Final answer
   x = 1,381.67