Finding the Fourth Proportional to 9,864.86, 13,613.43 and 5,388.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,864.86 : 13,613.43 = 5,388.61 : x
2. Step 2: Convert to fraction form
   9,864.86/13,613.43 = 5,388.61/x
3. Step 3: Cross multiply
   9,864.86x = 13,613.43 × 5,388.61
4. Step 4: Simplify right side
   9,864.86x = 73,357,472.12
5. Step 5: Solve for x
   x = 73,357,472.12/9,864.86
6. Step 6: Final answer
   x = 7,436.24