Finding the Fourth Proportional to 42,727.28, 64,091.99 and 13,145.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42,727.28 : 64,091.99 = 13,145.37 : x
2. Step 2: Convert to fraction form
   42,727.28/64,091.99 = 13,145.37/x
3. Step 3: Cross multiply
   42,727.28x = 64,091.99 × 13,145.37
4. Step 4: Simplify right side
   42,727.28x = 842,512,856.86
5. Step 5: Solve for x
   x = 842,512,856.86/42,727.28
6. Step 6: Final answer
   x = 19,718.38