Finding the Fourth Proportional to 3,478.37, 5,215.25 and 1,919.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,478.37 : 5,215.25 = 1,919.12 : x
2. Step 2: Convert to fraction form
   3,478.37/5,215.25 = 1,919.12/x
3. Step 3: Cross multiply
   3,478.37x = 5,215.25 × 1,919.12
4. Step 4: Simplify right side
   3,478.37x = 10,008,690.58
5. Step 5: Solve for x
   x = 10,008,690.58/3,478.37
6. Step 6: Final answer
   x = 2,877.41