Finding the Fourth Proportional to 3,478.86, 5,215.98 and 1,919.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,478.86 : 5,215.98 = 1,919.61 : x
2. Step 2: Convert to fraction form
   3,478.86/5,215.98 = 1,919.61/x
3. Step 3: Cross multiply
   3,478.86x = 5,215.98 × 1,919.61
4. Step 4: Simplify right side
   3,478.86x = 10,012,647.37
5. Step 5: Solve for x
   x = 10,012,647.37/3,478.86
6. Step 6: Final answer
   x = 2,878.14