Finding the Fourth Proportional to 3,877.72, 5,351.01 and 2,109.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,877.72 : 5,351.01 = 2,109.31 : x
2. Step 2: Convert to fraction form
   3,877.72/5,351.01 = 2,109.31/x
3. Step 3: Cross multiply
   3,877.72x = 5,351.01 × 2,109.31
4. Step 4: Simplify right side
   3,877.72x = 11,286,938.90
5. Step 5: Solve for x
   x = 11,286,938.90/3,877.72
6. Step 6: Final answer
   x = 2,910.72