Finding the Fourth Proportional to 5,078.60, 7,008.42 and 2,840.45

Step by Step Solution

1. Step 1: Write the proportion equation
   5,078.60 : 7,008.42 = 2,840.45 : x
2. Step 2: Convert to fraction form
   5,078.60/7,008.42 = 2,840.45/x
3. Step 3: Cross multiply
   5,078.60x = 7,008.42 × 2,840.45
4. Step 4: Simplify right side
   5,078.60x = 19,907,066.59
5. Step 5: Solve for x
   x = 19,907,066.59/5,078.60
6. Step 6: Final answer
   x = 3,919.79