Finding the Fourth Proportional to 3,886.50, 5,363.37 and 2,118.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.50 : 5,363.37 = 2,118.15 : x
2. Step 2: Convert to fraction form
   3,886.50/5,363.37 = 2,118.15/x
3. Step 3: Cross multiply
   3,886.50x = 5,363.37 × 2,118.15
4. Step 4: Simplify right side
   3,886.50x = 11,360,422.17
5. Step 5: Solve for x
   x = 11,360,422.17/3,886.50
6. Step 6: Final answer
   x = 2,923.05