Finding the Fourth Proportional to 9,622.80, 13,278.56 and 5,643.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,622.80 : 13,278.56 = 5,643.18 : x
2. Step 2: Convert to fraction form
   9,622.80/13,278.56 = 5,643.18/x
3. Step 3: Cross multiply
   9,622.80x = 13,278.56 × 5,643.18
4. Step 4: Simplify right side
   9,622.80x = 74,933,304.22
5. Step 5: Solve for x
   x = 74,933,304.22/9,622.80
6. Step 6: Final answer
   x = 7,787.06