Finding the Fourth Proportional to 105,290.37, 145,300.77 and 57,543.75

Step by Step Solution

1. Step 1: Write the proportion equation
   105,290.37 : 145,300.77 = 57,543.75 : x
2. Step 2: Convert to fraction form
   105,290.37/145,300.77 = 57,543.75/x
3. Step 3: Cross multiply
   105,290.37x = 145,300.77 × 57,543.75
4. Step 4: Simplify right side
   105,290.37x = 8,361,151,183.69
5. Step 5: Solve for x
   x = 8,361,151,183.69/105,290.37
6. Step 6: Final answer
   x = 79,410.41