Finding the Fourth Proportional to 3,866.81, 5,336.72 and 2,188.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,866.81 : 5,336.72 = 2,188.89 : x
2. Step 2: Convert to fraction form
   3,866.81/5,336.72 = 2,188.89/x
3. Step 3: Cross multiply
   3,866.81x = 5,336.72 × 2,188.89
4. Step 4: Simplify right side
   3,866.81x = 11,681,490.30
5. Step 5: Solve for x
   x = 11,681,490.30/3,866.81
6. Step 6: Final answer
   x = 3,020.97