Finding the Fourth Proportional to 105,031.16, 144,946.52 and 57,287.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,031.16 : 144,946.52 = 57,287.12 : x
2. Step 2: Convert to fraction form
   105,031.16/144,946.52 = 57,287.12/x
3. Step 3: Cross multiply
   105,031.16x = 144,946.52 × 57,287.12
4. Step 4: Simplify right side
   105,031.16x = 8,303,568,684.82
5. Step 5: Solve for x
   x = 8,303,568,684.82/105,031.16
6. Step 6: Final answer
   x = 79,058.15