Finding the Fourth Proportional to 12,417.71, 17,142.79 and 9,578.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,417.71 : 17,142.79 = 9,578.72 : x
2. Step 2: Convert to fraction form
   12,417.71/17,142.79 = 9,578.72/x
3. Step 3: Cross multiply
   12,417.71x = 17,142.79 × 9,578.72
4. Step 4: Simplify right side
   12,417.71x = 164,205,923.66
5. Step 5: Solve for x
   x = 164,205,923.66/12,417.71
6. Step 6: Final answer
   x = 13,223.52