Finding the Fourth Proportional to 9,231.32, 12,739.23 and 5,039.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,231.32 : 12,739.23 = 5,039.57 : x
2. Step 2: Convert to fraction form
   9,231.32/12,739.23 = 5,039.57/x
3. Step 3: Cross multiply
   9,231.32x = 12,739.23 × 5,039.57
4. Step 4: Simplify right side
   9,231.32x = 64,200,241.33
5. Step 5: Solve for x
   x = 64,200,241.33/9,231.32
6. Step 6: Final answer
   x = 6,954.61