Finding the Fourth Proportional to 6,638.88, 9,162.72 and 3,845.28

Step by Step Solution

1. Step 1: Write the proportion equation
   6,638.88 : 9,162.72 = 3,845.28 : x
2. Step 2: Convert to fraction form
   6,638.88/9,162.72 = 3,845.28/x
3. Step 3: Cross multiply
   6,638.88x = 9,162.72 × 3,845.28
4. Step 4: Simplify right side
   6,638.88x = 35,233,223.96
5. Step 5: Solve for x
   x = 35,233,223.96/6,638.88
6. Step 6: Final answer
   x = 5,307.10