Finding the Fourth Proportional to 31,058.29, 42,832.15 and 20,293.39

Step by Step Solution

1. Step 1: Write the proportion equation
   31,058.29 : 42,832.15 = 20,293.39 : x
2. Step 2: Convert to fraction form
   31,058.29/42,832.15 = 20,293.39/x
3. Step 3: Cross multiply
   31,058.29x = 42,832.15 × 20,293.39
4. Step 4: Simplify right side
   31,058.29x = 869,209,524.49
5. Step 5: Solve for x
   x = 869,209,524.49/31,058.29
6. Step 6: Final answer
   x = 27,986.39