Finding the Fourth Proportional to 3,870.36, 5,805.72 and 1,921.32

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.36 : 5,805.72 = 1,921.32 : x
2. Step 2: Convert to fraction form
   3,870.36/5,805.72 = 1,921.32/x
3. Step 3: Cross multiply
   3,870.36x = 5,805.72 × 1,921.32
4. Step 4: Simplify right side
   3,870.36x = 11,154,645.95
5. Step 5: Solve for x
   x = 11,154,645.95/3,870.36
6. Step 6: Final answer
   x = 2,882.07