Finding the Fourth Proportional to 1,778.72, 2,667.39 and 854.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,778.72 : 2,667.39 = 854.71 : x
2. Step 2: Convert to fraction form
   1,778.72/2,667.39 = 854.71/x
3. Step 3: Cross multiply
   1,778.72x = 2,667.39 × 854.71
4. Step 4: Simplify right side
   1,778.72x = 2,279,838.24
5. Step 5: Solve for x
   x = 2,279,838.24/1,778.72
6. Step 6: Final answer
   x = 1,281.73