Finding the Fourth Proportional to 5,078.42, 7,008.17 and 2,840.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,078.42 : 7,008.17 = 2,840.30 : x
2. Step 2: Convert to fraction form
   5,078.42/7,008.17 = 2,840.30/x
3. Step 3: Cross multiply
   5,078.42x = 7,008.17 × 2,840.30
4. Step 4: Simplify right side
   5,078.42x = 19,905,305.25
5. Step 5: Solve for x
   x = 19,905,305.25/5,078.42
6. Step 6: Final answer
   x = 3,919.59