Finding the Fourth Proportional to 13,281.69, 19,919.34 and 3,919.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,281.69 : 19,919.34 = 3,919.18 : x
2. Step 2: Convert to fraction form
   13,281.69/19,919.34 = 3,919.18/x
3. Step 3: Cross multiply
   13,281.69x = 19,919.34 × 3,919.18
4. Step 4: Simplify right side
   13,281.69x = 78,067,421.49
5. Step 5: Solve for x
   x = 78,067,421.49/13,281.69
6. Step 6: Final answer
   x = 5,877.82