Finding the Fourth Proportional to 9,574.12, 13,126.07 and 9,399.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,574.12 : 13,126.07 = 9,399.16 : x
2. Step 2: Convert to fraction form
   9,574.12/13,126.07 = 9,399.16/x
3. Step 3: Cross multiply
   9,574.12x = 13,126.07 × 9,399.16
4. Step 4: Simplify right side
   9,574.12x = 123,374,032.10
5. Step 5: Solve for x
   x = 123,374,032.10/9,574.12
6. Step 6: Final answer
   x = 12,886.20