Finding the Fourth Proportional to 4,811.72, 6,639.98 and 3,020.15

Step by Step Solution

1. Step 1: Write the proportion equation
   4,811.72 : 6,639.98 = 3,020.15 : x
2. Step 2: Convert to fraction form
   4,811.72/6,639.98 = 3,020.15/x
3. Step 3: Cross multiply
   4,811.72x = 6,639.98 × 3,020.15
4. Step 4: Simplify right side
   4,811.72x = 20,053,759.75
5. Step 5: Solve for x
   x = 20,053,759.75/4,811.72
6. Step 6: Final answer
   x = 4,167.69