Finding the Fourth Proportional to 6,622.86, 9,139.52 and 3,638.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,622.86 : 9,139.52 = 3,638.72 : x
2. Step 2: Convert to fraction form
   6,622.86/9,139.52 = 3,638.72/x
3. Step 3: Cross multiply
   6,622.86x = 9,139.52 × 3,638.72
4. Step 4: Simplify right side
   6,622.86x = 33,256,154.21
5. Step 5: Solve for x
   x = 33,256,154.21/6,622.86
6. Step 6: Final answer
   x = 5,021.42