Finding the Fourth Proportional to 42,734.58, 64,078.38 and 13,144.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,734.58 : 64,078.38 = 13,144.20 : x
2. Step 2: Convert to fraction form
   42,734.58/64,078.38 = 13,144.20/x
3. Step 3: Cross multiply
   42,734.58x = 64,078.38 × 13,144.20
4. Step 4: Simplify right side
   42,734.58x = 842,259,042.40
5. Step 5: Solve for x
   x = 842,259,042.40/42,734.58
6. Step 6: Final answer
   x = 19,709.08