Finding the Fourth Proportional to 80,574.78, 111,103.56 and 55,085.31

Step by Step Solution

1. Step 1: Write the proportion equation
   80,574.78 : 111,103.56 = 55,085.31 : x
2. Step 2: Convert to fraction form
   80,574.78/111,103.56 = 55,085.31/x
3. Step 3: Cross multiply
   80,574.78x = 111,103.56 × 55,085.31
4. Step 4: Simplify right side
   80,574.78x = 6,120,174,044.70
5. Step 5: Solve for x
   x = 6,120,174,044.70/80,574.78
6. Step 6: Final answer
   x = 75,956.45