Finding the Fourth Proportional to 13,868.31, 20,801.85 and 3,873.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,868.31 : 20,801.85 = 3,873.12 : x
2. Step 2: Convert to fraction form
   13,868.31/20,801.85 = 3,873.12/x
3. Step 3: Cross multiply
   13,868.31x = 20,801.85 × 3,873.12
4. Step 4: Simplify right side
   13,868.31x = 80,568,061.27
5. Step 5: Solve for x
   x = 80,568,061.27/13,868.31
6. Step 6: Final answer
   x = 5,809.51