Finding the Fourth Proportional to 2,156.54, 3,233.43 and 840.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.54 : 3,233.43 = 840.29 : x
2. Step 2: Convert to fraction form
   2,156.54/3,233.43 = 840.29/x
3. Step 3: Cross multiply
   2,156.54x = 3,233.43 × 840.29
4. Step 4: Simplify right side
   2,156.54x = 2,717,002.73
5. Step 5: Solve for x
   x = 2,717,002.73/2,156.54
6. Step 6: Final answer
   x = 1,259.89