Finding the Fourth Proportional to 3,869.89, 5,340.45 and 2,101.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,869.89 : 5,340.45 = 2,101.50 : x
2. Step 2: Convert to fraction form
   3,869.89/5,340.45 = 2,101.50/x
3. Step 3: Cross multiply
   3,869.89x = 5,340.45 × 2,101.50
4. Step 4: Simplify right side
   3,869.89x = 11,222,928.97
5. Step 5: Solve for x
   x = 11,222,928.97/3,869.89
6. Step 6: Final answer
   x = 2,900.06