Finding the Fourth Proportional to 22,622, 31,219.80 and 12,686

Step by Step Solution

1. Step 1: Write the proportion equation
   22,622 : 31,219.80 = 12,686 : x
2. Step 2: Convert to fraction form
   22,622/31,219.80 = 12,686/x
3. Step 3: Cross multiply
   22,622x = 31,219.80 × 12,686
4. Step 4: Simplify right side
   22,622x = 396,054,382.80
5. Step 5: Solve for x
   x = 396,054,382.80/22,622
6. Step 6: Final answer
   x = 17,507.49