Finding the Fourth Proportional to 42,725.75, 64,097.16 and 13,142.45

Step by Step Solution

1. Step 1: Write the proportion equation
   42,725.75 : 64,097.16 = 13,142.45 : x
2. Step 2: Convert to fraction form
   42,725.75/64,097.16 = 13,142.45/x
3. Step 3: Cross multiply
   42,725.75x = 64,097.16 × 13,142.45
4. Step 4: Simplify right side
   42,725.75x = 842,393,831.40
5. Step 5: Solve for x
   x = 842,393,831.40/42,725.75
6. Step 6: Final answer
   x = 19,716.31