Finding the Fourth Proportional to 3,877.55, 5,350.86 and 2,109.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,877.55 : 5,350.86 = 2,109.15 : x
2. Step 2: Convert to fraction form
   3,877.55/5,350.86 = 2,109.15/x
3. Step 3: Cross multiply
   3,877.55x = 5,350.86 × 2,109.15
4. Step 4: Simplify right side
   3,877.55x = 11,285,766.37
5. Step 5: Solve for x
   x = 11,285,766.37/3,877.55
6. Step 6: Final answer
   x = 2,910.54