Finding the Fourth Proportional to 3,887.10, 5,364.18 and 2,118.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,887.10 : 5,364.18 = 2,118.69 : x
2. Step 2: Convert to fraction form
   3,887.10/5,364.18 = 2,118.69/x
3. Step 3: Cross multiply
   3,887.10x = 5,364.18 × 2,118.69
4. Step 4: Simplify right side
   3,887.10x = 11,365,034.52
5. Step 5: Solve for x
   x = 11,365,034.52/3,887.10
6. Step 6: Final answer
   x = 2,923.78