Finding the Fourth Proportional to 3,479.37, 5,216.75 and 1,920.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,479.37 : 5,216.75 = 1,920.12 : x
2. Step 2: Convert to fraction form
   3,479.37/5,216.75 = 1,920.12/x
3. Step 3: Cross multiply
   3,479.37x = 5,216.75 × 1,920.12
4. Step 4: Simplify right side
   3,479.37x = 10,016,786.01
5. Step 5: Solve for x
   x = 10,016,786.01/3,479.37
6. Step 6: Final answer
   x = 2,878.91