Finding the Fourth Proportional to 9,640.90, 13,305.52 and 5,449.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,640.90 : 13,305.52 = 5,449.42 : x
2. Step 2: Convert to fraction form
   9,640.90/13,305.52 = 5,449.42/x
3. Step 3: Cross multiply
   9,640.90x = 13,305.52 × 5,449.42
4. Step 4: Simplify right side
   9,640.90x = 72,507,366.80
5. Step 5: Solve for x
   x = 72,507,366.80/9,640.90
6. Step 6: Final answer
   x = 7,520.81