Finding the Fourth Proportional to 3,886.93, 5,363.89 and 2,118.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.93 : 5,363.89 = 2,118.51 : x
2. Step 2: Convert to fraction form
   3,886.93/5,363.89 = 2,118.51/x
3. Step 3: Cross multiply
   3,886.93x = 5,363.89 × 2,118.51
4. Step 4: Simplify right side
   3,886.93x = 11,363,454.60
5. Step 5: Solve for x
   x = 11,363,454.60/3,886.93
6. Step 6: Final answer
   x = 2,923.50