Finding the Fourth Proportional to 20,798.28, 31,162.22 and 12,573

Step by Step Solution

1. Step 1: Write the proportion equation
   20,798.28 : 31,162.22 = 12,573 : x
2. Step 2: Convert to fraction form
   20,798.28/31,162.22 = 12,573/x
3. Step 3: Cross multiply
   20,798.28x = 31,162.22 × 12,573
4. Step 4: Simplify right side
   20,798.28x = 391,802,592.06
5. Step 5: Solve for x
   x = 391,802,592.06/20,798.28
6. Step 6: Final answer
   x = 18,838.22