Finding the Fourth Proportional to 105,144.48, 145,101.24 and 57,399.84

Step by Step Solution

1. Step 1: Write the proportion equation
   105,144.48 : 145,101.24 = 57,399.84 : x
2. Step 2: Convert to fraction form
   105,144.48/145,101.24 = 57,399.84/x
3. Step 3: Cross multiply
   105,144.48x = 145,101.24 × 57,399.84
4. Step 4: Simplify right side
   105,144.48x = 8,328,787,959.80
5. Step 5: Solve for x
   x = 8,328,787,959.80/105,144.48
6. Step 6: Final answer
   x = 79,212.79