Finding the Fourth Proportional to 6,140.30, 8,480.72 and 4,469.20

Step by Step Solution

1. Step 1: Write the proportion equation
   6,140.30 : 8,480.72 = 4,469.20 : x
2. Step 2: Convert to fraction form
   6,140.30/8,480.72 = 4,469.20/x
3. Step 3: Cross multiply
   6,140.30x = 8,480.72 × 4,469.20
4. Step 4: Simplify right side
   6,140.30x = 37,902,033.82
5. Step 5: Solve for x
   x = 37,902,033.82/6,140.30
6. Step 6: Final answer
   x = 6,172.67