Finding the Fourth Proportional to 9,865.32, 13,613.43 and 5,388.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,865.32 : 13,613.43 = 5,388.12 : x
2. Step 2: Convert to fraction form
   9,865.32/13,613.43 = 5,388.12/x
3. Step 3: Cross multiply
   9,865.32x = 13,613.43 × 5,388.12
4. Step 4: Simplify right side
   9,865.32x = 73,350,791.93
5. Step 5: Solve for x
   x = 73,350,791.93/9,865.32
6. Step 6: Final answer
   x = 7,435.22