Finding the Fourth Proportional to 31,017, 42,816.78 and 20,959.32

Step by Step Solution

1. Step 1: Write the proportion equation
   31,017 : 42,816.78 = 20,959.32 : x
2. Step 2: Convert to fraction form
   31,017/42,816.78 = 20,959.32/x
3. Step 3: Cross multiply
   31,017x = 42,816.78 × 20,959.32
4. Step 4: Simplify right side
   31,017x = 897,410,593.39
5. Step 5: Solve for x
   x = 897,410,593.39/31,017
6. Step 6: Final answer
   x = 28,932.86