Finding the Fourth Proportional to 42,744.16, 64,129.14 and 12,759.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42,744.16 : 64,129.14 = 12,759.37 : x
2. Step 2: Convert to fraction form
   42,744.16/64,129.14 = 12,759.37/x
3. Step 3: Cross multiply
   42,744.16x = 64,129.14 × 12,759.37
4. Step 4: Simplify right side
   42,744.16x = 818,247,264.72
5. Step 5: Solve for x
   x = 818,247,264.72/42,744.16
6. Step 6: Final answer
   x = 19,142.90