Finding the Fourth Proportional to 3,870.05, 5,340.69 and 2,101.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.05 : 5,340.69 = 2,101.64 : x
2. Step 2: Convert to fraction form
   3,870.05/5,340.69 = 2,101.64/x
3. Step 3: Cross multiply
   3,870.05x = 5,340.69 × 2,101.64
4. Step 4: Simplify right side
   3,870.05x = 11,224,181.03
5. Step 5: Solve for x
   x = 11,224,181.03/3,870.05
6. Step 6: Final answer
   x = 2,900.27