Finding the Fourth Proportional to 3,875.12, 5,811.27 and 2,121.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,875.12 : 5,811.27 = 2,121.42 : x
2. Step 2: Convert to fraction form
   3,875.12/5,811.27 = 2,121.42/x
3. Step 3: Cross multiply
   3,875.12x = 5,811.27 × 2,121.42
4. Step 4: Simplify right side
   3,875.12x = 12,328,144.40
5. Step 5: Solve for x
   x = 12,328,144.40/3,875.12
6. Step 6: Final answer
   x = 3,181.36