Finding the Fourth Proportional to 22,722, 31,356.72 and 13,297.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,722 : 31,356.72 = 13,297.20 : x
2. Step 2: Convert to fraction form
   22,722/31,356.72 = 13,297.20/x
3. Step 3: Cross multiply
   22,722x = 31,356.72 × 13,297.20
4. Step 4: Simplify right side
   22,722x = 416,956,577.18
5. Step 5: Solve for x
   x = 416,956,577.18/22,722
6. Step 6: Final answer
   x = 18,350.35