Finding the Fourth Proportional to 12,619.25, 17,288.45 and 12,146.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,619.25 : 17,288.45 = 12,146.31 : x
2. Step 2: Convert to fraction form
   12,619.25/17,288.45 = 12,146.31/x
3. Step 3: Cross multiply
   12,619.25x = 17,288.45 × 12,146.31
4. Step 4: Simplify right side
   12,619.25x = 209,990,873.12
5. Step 5: Solve for x
   x = 209,990,873.12/12,619.25
6. Step 6: Final answer
   x = 16,640.52