Finding the Fourth Proportional to 12,443.13, 17,187.96 and 9,219.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.13 : 17,187.96 = 9,219.51 : x
2. Step 2: Convert to fraction form
   12,443.13/17,187.96 = 9,219.51/x
3. Step 3: Cross multiply
   12,443.13x = 17,187.96 × 9,219.51
4. Step 4: Simplify right side
   12,443.13x = 158,464,569.10
5. Step 5: Solve for x
   x = 158,464,569.10/12,443.13
6. Step 6: Final answer
   x = 12,735.11