Finding the Fourth Proportional to 42,426.48, 63,647.55 and 13,965.03

Step by Step Solution

1. Step 1: Write the proportion equation
   42,426.48 : 63,647.55 = 13,965.03 : x
2. Step 2: Convert to fraction form
   42,426.48/63,647.55 = 13,965.03/x
3. Step 3: Cross multiply
   42,426.48x = 63,647.55 × 13,965.03
4. Step 4: Simplify right side
   42,426.48x = 888,839,945.18
5. Step 5: Solve for x
   x = 888,839,945.18/42,426.48
6. Step 6: Final answer
   x = 20,950.12