Finding the Fourth Proportional to 31,071.27, 42,864.71 and 20,996.03

Step by Step Solution

1. Step 1: Write the proportion equation
   31,071.27 : 42,864.71 = 20,996.03 : x
2. Step 2: Convert to fraction form
   31,071.27/42,864.71 = 20,996.03/x
3. Step 3: Cross multiply
   31,071.27x = 42,864.71 × 20,996.03
4. Step 4: Simplify right side
   31,071.27x = 899,988,632.12
5. Step 5: Solve for x
   x = 899,988,632.12/31,071.27
6. Step 6: Final answer
   x = 28,965.30