Finding the Fourth Proportional to 3,886.42, 5,363.28 and 2,118.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.42 : 5,363.28 = 2,118.04 : x
2. Step 2: Convert to fraction form
   3,886.42/5,363.28 = 2,118.04/x
3. Step 3: Cross multiply
   3,886.42x = 5,363.28 × 2,118.04
4. Step 4: Simplify right side
   3,886.42x = 11,359,641.57
5. Step 5: Solve for x
   x = 11,359,641.57/3,886.42
6. Step 6: Final answer
   x = 2,922.91