Finding the Fourth Proportional to 42,727.86, 64,091.94 and 13,145.48

Step by Step Solution

1. Step 1: Write the proportion equation
   42,727.86 : 64,091.94 = 13,145.48 : x
2. Step 2: Convert to fraction form
   42,727.86/64,091.94 = 13,145.48/x
3. Step 3: Cross multiply
   42,727.86x = 64,091.94 × 13,145.48
4. Step 4: Simplify right side
   42,727.86x = 842,519,315.43
5. Step 5: Solve for x
   x = 842,519,315.43/42,727.86
6. Step 6: Final answer
   x = 19,718.27