Finding the Fourth Proportional to 3,878.06, 5,820.46 and 2,215.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878.06 : 5,820.46 = 2,215.51 : x
2. Step 2: Convert to fraction form
   3,878.06/5,820.46 = 2,215.51/x
3. Step 3: Cross multiply
   3,878.06x = 5,820.46 × 2,215.51
4. Step 4: Simplify right side
   3,878.06x = 12,895,287.33
5. Step 5: Solve for x
   x = 12,895,287.33/3,878.06
6. Step 6: Final answer
   x = 3,325.19