Finding the Fourth Proportional to 3,869.98, 5,340.56 and 2,101.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,869.98 : 5,340.56 = 2,101.57 : x
2. Step 2: Convert to fraction form
   3,869.98/5,340.56 = 2,101.57/x
3. Step 3: Cross multiply
   3,869.98x = 5,340.56 × 2,101.57
4. Step 4: Simplify right side
   3,869.98x = 11,223,557.75
5. Step 5: Solve for x
   x = 11,223,557.75/3,869.98
6. Step 6: Final answer
   x = 2,900.16