Finding the Fourth Proportional to 12,738.65, 17,574.51 and 9,389.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,738.65 : 17,574.51 = 9,389.48 : x
2. Step 2: Convert to fraction form
   12,738.65/17,574.51 = 9,389.48/x
3. Step 3: Cross multiply
   12,738.65x = 17,574.51 × 9,389.48
4. Step 4: Simplify right side
   12,738.65x = 165,015,422.28
5. Step 5: Solve for x
   x = 165,015,422.28/12,738.65
6. Step 6: Final answer
   x = 12,953.92