Finding the Fourth Proportional to 6,622.79, 9,139.31 and 3,638.55

Step by Step Solution

1. Step 1: Write the proportion equation
   6,622.79 : 9,139.31 = 3,638.55 : x
2. Step 2: Convert to fraction form
   6,622.79/9,139.31 = 3,638.55/x
3. Step 3: Cross multiply
   6,622.79x = 9,139.31 × 3,638.55
4. Step 4: Simplify right side
   6,622.79x = 33,253,818.21
5. Step 5: Solve for x
   x = 33,253,818.21/6,622.79
6. Step 6: Final answer
   x = 5,021.12