Finding the Fourth Proportional to 3,870.90, 5,341.71 and 2,102.49

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.90 : 5,341.71 = 2,102.49 : x
2. Step 2: Convert to fraction form
   3,870.90/5,341.71 = 2,102.49/x
3. Step 3: Cross multiply
   3,870.90x = 5,341.71 × 2,102.49
4. Step 4: Simplify right side
   3,870.90x = 11,230,891.86
5. Step 5: Solve for x
   x = 11,230,891.86/3,870.90
6. Step 6: Final answer
   x = 2,901.36