Finding the Fourth Proportional to 6,622.78, 9,139.58 and 3,638.83

Step by Step Solution

1. Step 1: Write the proportion equation
   6,622.78 : 9,139.58 = 3,638.83 : x
2. Step 2: Convert to fraction form
   6,622.78/9,139.58 = 3,638.83/x
3. Step 3: Cross multiply
   6,622.78x = 9,139.58 × 3,638.83
4. Step 4: Simplify right side
   6,622.78x = 33,257,377.89
5. Step 5: Solve for x
   x = 33,257,377.89/6,622.78
6. Step 6: Final answer
   x = 5,021.66