Finding the Fourth Proportional to 3,711.89, 5,120.96 and 2,118.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,711.89 : 5,120.96 = 2,118.12 : x
2. Step 2: Convert to fraction form
   3,711.89/5,120.96 = 2,118.12/x
3. Step 3: Cross multiply
   3,711.89x = 5,120.96 × 2,118.12
4. Step 4: Simplify right side
   3,711.89x = 10,846,778.00
5. Step 5: Solve for x
   x = 10,846,778.00/3,711.89
6. Step 6: Final answer
   x = 2,922.17