Finding the Fourth Proportional to 6,643.80, 9,963.54 and 3,522.06

Step by Step Solution

1. Step 1: Write the proportion equation
   6,643.80 : 9,963.54 = 3,522.06 : x
2. Step 2: Convert to fraction form
   6,643.80/9,963.54 = 3,522.06/x
3. Step 3: Cross multiply
   6,643.80x = 9,963.54 × 3,522.06
4. Step 4: Simplify right side
   6,643.80x = 35,092,185.69
5. Step 5: Solve for x
   x = 35,092,185.69/6,643.80
6. Step 6: Final answer
   x = 5,281.94