Finding the Fourth Proportional to 5,379.82, 8,068.25 and 3,815.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,379.82 : 8,068.25 = 3,815.20 : x
2. Step 2: Convert to fraction form
   5,379.82/8,068.25 = 3,815.20/x
3. Step 3: Cross multiply
   5,379.82x = 8,068.25 × 3,815.20
4. Step 4: Simplify right side
   5,379.82x = 30,781,987.40
5. Step 5: Solve for x
   x = 30,781,987.40/5,379.82
6. Step 6: Final answer
   x = 5,721.75