Finding the Fourth Proportional to 3,870.66, 5,341.55 and 2,102.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.66 : 5,341.55 = 2,102.30 : x
2. Step 2: Convert to fraction form
   3,870.66/5,341.55 = 2,102.30/x
3. Step 3: Cross multiply
   3,870.66x = 5,341.55 × 2,102.30
4. Step 4: Simplify right side
   3,870.66x = 11,229,540.57
5. Step 5: Solve for x
   x = 11,229,540.57/3,870.66
6. Step 6: Final answer
   x = 2,901.20