Finding the Fourth Proportional to 105,528.52, 145,630.96 and 57,786.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,528.52 : 145,630.96 = 57,786.31 : x
2. Step 2: Convert to fraction form
   105,528.52/145,630.96 = 57,786.31/x
3. Step 3: Cross multiply
   105,528.52x = 145,630.96 × 57,786.31
4. Step 4: Simplify right side
   105,528.52x = 8,415,476,162.78
5. Step 5: Solve for x
   x = 8,415,476,162.78/105,528.52
6. Step 6: Final answer
   x = 79,745.99