Finding the Fourth Proportional to 1,555.34, 2,146.39 and 856.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.34 : 2,146.39 = 856.71 : x
2. Step 2: Convert to fraction form
   1,555.34/2,146.39 = 856.71/x
3. Step 3: Cross multiply
   1,555.34x = 2,146.39 × 856.71
4. Step 4: Simplify right side
   1,555.34x = 1,838,831.64
5. Step 5: Solve for x
   x = 1,838,831.64/1,555.34
6. Step 6: Final answer
   x = 1,182.27