Finding the Fourth Proportional to 9,864.91, 13,613.68 and 5,388.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,864.91 : 13,613.68 = 5,388.79 : x
2. Step 2: Convert to fraction form
   9,864.91/13,613.68 = 5,388.79/x
3. Step 3: Cross multiply
   9,864.91x = 13,613.68 × 5,388.79
4. Step 4: Simplify right side
   9,864.91x = 73,361,262.65
5. Step 5: Solve for x
   x = 73,361,262.65/9,864.91
6. Step 6: Final answer
   x = 7,436.59