Finding the Fourth Proportional to 42,754.38, 64,138.59 and 13,171.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,754.38 : 64,138.59 = 13,171.56 : x
2. Step 2: Convert to fraction form
   42,754.38/64,138.59 = 13,171.56/x
3. Step 3: Cross multiply
   42,754.38x = 64,138.59 × 13,171.56
4. Step 4: Simplify right side
   42,754.38x = 844,805,286.50
5. Step 5: Solve for x
   x = 844,805,286.50/42,754.38
6. Step 6: Final answer
   x = 19,759.50