Finding the Fourth Proportional to 3,870.10, 5,340.72 and 2,101.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.10 : 5,340.72 = 2,101.69 : x
2. Step 2: Convert to fraction form
   3,870.10/5,340.72 = 2,101.69/x
3. Step 3: Cross multiply
   3,870.10x = 5,340.72 × 2,101.69
4. Step 4: Simplify right side
   3,870.10x = 11,224,537.82
5. Step 5: Solve for x
   x = 11,224,537.82/3,870.10
6. Step 6: Final answer
   x = 2,900.32