Finding the Fourth Proportional to 1,432.72, 2,146.08 and 855.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.72 : 2,146.08 = 855.28 : x
2. Step 2: Convert to fraction form
   1,432.72/2,146.08 = 855.28/x
3. Step 3: Cross multiply
   1,432.72x = 2,146.08 × 855.28
4. Step 4: Simplify right side
   1,432.72x = 1,835,499.30
5. Step 5: Solve for x
   x = 1,835,499.30/1,432.72
6. Step 6: Final answer
   x = 1,281.13