Finding the Fourth Proportional to 3,886.50, 5,363.17 and 2,118.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.50 : 5,363.17 = 2,118.09 : x
2. Step 2: Convert to fraction form
   3,886.50/5,363.17 = 2,118.09/x
3. Step 3: Cross multiply
   3,886.50x = 5,363.17 × 2,118.09
4. Step 4: Simplify right side
   3,886.50x = 11,359,676.75
5. Step 5: Solve for x
   x = 11,359,676.75/3,886.50
6. Step 6: Final answer
   x = 2,922.86