Finding the Fourth Proportional to 80,498.26, 111,049 and 56,638.09

Step by Step Solution

1. Step 1: Write the proportion equation
   80,498.26 : 111,049 = 56,638.09 : x
2. Step 2: Convert to fraction form
   80,498.26/111,049 = 56,638.09/x
3. Step 3: Cross multiply
   80,498.26x = 111,049 × 56,638.09
4. Step 4: Simplify right side
   80,498.26x = 6,289,603,256.41
5. Step 5: Solve for x
   x = 6,289,603,256.41/80,498.26
6. Step 6: Final answer
   x = 78,133.41