Finding the Fourth Proportional to 31,622, 43,647.46 and 20,874.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,622 : 43,647.46 = 20,874.72 : x
2. Step 2: Convert to fraction form
   31,622/43,647.46 = 20,874.72/x
3. Step 3: Cross multiply
   31,622x = 43,647.46 × 20,874.72
4. Step 4: Simplify right side
   31,622x = 911,128,506.21
5. Step 5: Solve for x
   x = 911,128,506.21/31,622
6. Step 6: Final answer
   x = 28,813.12