Finding the Fourth Proportional to 2,725.89, 4,089.05 and 851.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,725.89 : 4,089.05 = 851.55 : x
2. Step 2: Convert to fraction form
   2,725.89/4,089.05 = 851.55/x
3. Step 3: Cross multiply
   2,725.89x = 4,089.05 × 851.55
4. Step 4: Simplify right side
   2,725.89x = 3,482,030.53
5. Step 5: Solve for x
   x = 3,482,030.53/2,725.89
6. Step 6: Final answer
   x = 1,277.39