Finding the Fourth Proportional to 6,621.50, 9,139.32 and 3,828.62

Step by Step Solution

1. Step 1: Write the proportion equation
   6,621.50 : 9,139.32 = 3,828.62 : x
2. Step 2: Convert to fraction form
   6,621.50/9,139.32 = 3,828.62/x
3. Step 3: Cross multiply
   6,621.50x = 9,139.32 × 3,828.62
4. Step 4: Simplify right side
   6,621.50x = 34,990,983.34
5. Step 5: Solve for x
   x = 34,990,983.34/6,621.50
6. Step 6: Final answer
   x = 5,284.45