Finding the Fourth Proportional to 3,886.73, 5,363.82 and 2,118.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.73 : 5,363.82 = 2,118.45 : x
2. Step 2: Convert to fraction form
   3,886.73/5,363.82 = 2,118.45/x
3. Step 3: Cross multiply
   3,886.73x = 5,363.82 × 2,118.45
4. Step 4: Simplify right side
   3,886.73x = 11,363,004.59
5. Step 5: Solve for x
   x = 11,363,004.59/3,886.73
6. Step 6: Final answer
   x = 2,923.54