Finding the Fourth Proportional to 42,628.50, 63,965.79 and 20,740.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,628.50 : 63,965.79 = 20,740.50 : x
2. Step 2: Convert to fraction form
   42,628.50/63,965.79 = 20,740.50/x
3. Step 3: Cross multiply
   42,628.50x = 63,965.79 × 20,740.50
4. Step 4: Simplify right side
   42,628.50x = 1,326,682,467.50
5. Step 5: Solve for x
   x = 1,326,682,467.50/42,628.50
6. Step 6: Final answer
   x = 31,121.96