Finding the Fourth Proportional to 1,555.28, 2,146.28 and 856.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.28 : 2,146.28 = 856.72 : x
2. Step 2: Convert to fraction form
   1,555.28/2,146.28 = 856.72/x
3. Step 3: Cross multiply
   1,555.28x = 2,146.28 × 856.72
4. Step 4: Simplify right side
   1,555.28x = 1,838,761.00
5. Step 5: Solve for x
   x = 1,838,761.00/1,555.28
6. Step 6: Final answer
   x = 1,182.27