Finding the Fourth Proportional to 20,870.22, 31,295.42 and 12,107.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,870.22 : 31,295.42 = 12,107.82 : x
2. Step 2: Convert to fraction form
   20,870.22/31,295.42 = 12,107.82/x
3. Step 3: Cross multiply
   20,870.22x = 31,295.42 × 12,107.82
4. Step 4: Simplify right side
   20,870.22x = 378,919,312.18
5. Step 5: Solve for x
   x = 378,919,312.18/20,870.22
6. Step 6: Final answer
   x = 18,155.98