Finding the Fourth Proportional to 42,744.72, 64,117.38 and 13,162.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,744.72 : 64,117.38 = 13,162.80 : x
2. Step 2: Convert to fraction form
   42,744.72/64,117.38 = 13,162.80/x
3. Step 3: Cross multiply
   42,744.72x = 64,117.38 × 13,162.80
4. Step 4: Simplify right side
   42,744.72x = 843,964,249.46
5. Step 5: Solve for x
   x = 843,964,249.46/42,744.72
6. Step 6: Final answer
   x = 19,744.29