Finding the Fourth Proportional to 31,020.90, 42,815.01 and 18,443.22

Step by Step Solution

1. Step 1: Write the proportion equation
   31,020.90 : 42,815.01 = 18,443.22 : x
2. Step 2: Convert to fraction form
   31,020.90/42,815.01 = 18,443.22/x
3. Step 3: Cross multiply
   31,020.90x = 42,815.01 × 18,443.22
4. Step 4: Simplify right side
   31,020.90x = 789,646,648.73
5. Step 5: Solve for x
   x = 789,646,648.73/31,020.90
6. Step 6: Final answer
   x = 25,455.31