Finding the Fourth Proportional to 6,078.60, 8,388.72 and 3,720

Step by Step Solution

1. Step 1: Write the proportion equation
   6,078.60 : 8,388.72 = 3,720 : x
2. Step 2: Convert to fraction form
   6,078.60/8,388.72 = 3,720/x
3. Step 3: Cross multiply
   6,078.60x = 8,388.72 × 3,720
4. Step 4: Simplify right side
   6,078.60x = 31,206,038.40
5. Step 5: Solve for x
   x = 31,206,038.40/6,078.60
6. Step 6: Final answer
   x = 5,133.75