Finding the Fourth Proportional to 42,656, 64,007.04 and 20,768

Step by Step Solution

1. Step 1: Write the proportion equation
   42,656 : 64,007.04 = 20,768 : x
2. Step 2: Convert to fraction form
   42,656/64,007.04 = 20,768/x
3. Step 3: Cross multiply
   42,656x = 64,007.04 × 20,768
4. Step 4: Simplify right side
   42,656x = 1,329,298,206.72
5. Step 5: Solve for x
   x = 1,329,298,206.72/42,656
6. Step 6: Final answer
   x = 31,163.22