Finding the Fourth Proportional to 9,864.88, 13,613.61 and 5,388.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,864.88 : 13,613.61 = 5,388.55 : x
2. Step 2: Convert to fraction form
   9,864.88/13,613.61 = 5,388.55/x
3. Step 3: Cross multiply
   9,864.88x = 13,613.61 × 5,388.55
4. Step 4: Simplify right side
   9,864.88x = 73,357,618.17
5. Step 5: Solve for x
   x = 73,357,618.17/9,864.88
6. Step 6: Final answer
   x = 7,436.24