Finding the Fourth Proportional to 13,456.51, 20,174.72 and 9,284.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,456.51 : 20,174.72 = 9,284.61 : x
2. Step 2: Convert to fraction form
   13,456.51/20,174.72 = 9,284.61/x
3. Step 3: Cross multiply
   13,456.51x = 20,174.72 × 9,284.61
4. Step 4: Simplify right side
   13,456.51x = 187,314,436.29
5. Step 5: Solve for x
   x = 187,314,436.29/13,456.51
6. Step 6: Final answer
   x = 13,919.99