Finding the Fourth Proportional to 105,111.81, 145,057.86 and 57,367.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,111.81 : 145,057.86 = 57,367.80 : x
2. Step 2: Convert to fraction form
   105,111.81/145,057.86 = 57,367.80/x
3. Step 3: Cross multiply
   105,111.81x = 145,057.86 × 57,367.80
4. Step 4: Simplify right side
   105,111.81x = 8,321,650,300.91
5. Step 5: Solve for x
   x = 8,321,650,300.91/105,111.81
6. Step 6: Final answer
   x = 79,169.51