Finding the Fourth Proportional to 9,865.94, 13,615.32 and 5,390.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,865.94 : 13,615.32 = 5,390.12 : x
2. Step 2: Convert to fraction form
   9,865.94/13,615.32 = 5,390.12/x
3. Step 3: Cross multiply
   9,865.94x = 13,615.32 × 5,390.12
4. Step 4: Simplify right side
   9,865.94x = 73,388,208.64
5. Step 5: Solve for x
   x = 73,388,208.64/9,865.94
6. Step 6: Final answer
   x = 7,438.54