Finding the Fourth Proportional to 2,151.56, 3,227.06 and 853.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.56 : 3,227.06 = 853.94 : x
2. Step 2: Convert to fraction form
   2,151.56/3,227.06 = 853.94/x
3. Step 3: Cross multiply
   2,151.56x = 3,227.06 × 853.94
4. Step 4: Simplify right side
   2,151.56x = 2,755,715.62
5. Step 5: Solve for x
   x = 2,755,715.62/2,151.56
6. Step 6: Final answer
   x = 1,280.80