Finding the Fourth Proportional to 31,137.05, 42,924.67 and 20,508.23

Step by Step Solution

1. Step 1: Write the proportion equation
   31,137.05 : 42,924.67 = 20,508.23 : x
2. Step 2: Convert to fraction form
   31,137.05/42,924.67 = 20,508.23/x
3. Step 3: Cross multiply
   31,137.05x = 42,924.67 × 20,508.23
4. Step 4: Simplify right side
   31,137.05x = 880,309,005.03
5. Step 5: Solve for x
   x = 880,309,005.03/31,137.05
6. Step 6: Final answer
   x = 28,272.07