Finding the Fourth Proportional to 1,555.41, 2,146.37 and 856.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.41 : 2,146.37 = 856.79 : x
2. Step 2: Convert to fraction form
   1,555.41/2,146.37 = 856.79/x
3. Step 3: Cross multiply
   1,555.41x = 2,146.37 × 856.79
4. Step 4: Simplify right side
   1,555.41x = 1,838,973.34
5. Step 5: Solve for x
   x = 1,838,973.34/1,555.41
6. Step 6: Final answer
   x = 1,182.31