Finding the Fourth Proportional to 9,231.06, 12,738.87 and 5,039.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,231.06 : 12,738.87 = 5,039.31 : x
2. Step 2: Convert to fraction form
   9,231.06/12,738.87 = 5,039.31/x
3. Step 3: Cross multiply
   9,231.06x = 12,738.87 × 5,039.31
4. Step 4: Simplify right side
   9,231.06x = 64,195,114.98
5. Step 5: Solve for x
   x = 64,195,114.98/9,231.06
6. Step 6: Final answer
   x = 6,954.25