Finding the Fourth Proportional to 9,231.05, 12,738.78 and 5,039.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,231.05 : 12,738.78 = 5,039.30 : x
2. Step 2: Convert to fraction form
   9,231.05/12,738.78 = 5,039.30/x
3. Step 3: Cross multiply
   9,231.05x = 12,738.78 × 5,039.30
4. Step 4: Simplify right side
   9,231.05x = 64,194,534.05
5. Step 5: Solve for x
   x = 64,194,534.05/9,231.05
6. Step 6: Final answer
   x = 6,954.20