Finding the Fourth Proportional to 3,886.43, 5,363.25 and 2,118.02

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.43 : 5,363.25 = 2,118.02 : x
2. Step 2: Convert to fraction form
   3,886.43/5,363.25 = 2,118.02/x
3. Step 3: Cross multiply
   3,886.43x = 5,363.25 × 2,118.02
4. Step 4: Simplify right side
   3,886.43x = 11,359,436.01
5. Step 5: Solve for x
   x = 11,359,436.01/3,886.43
6. Step 6: Final answer
   x = 2,922.85