Finding the Fourth Proportional to 80,498.39, 111,049.18 and 56,638.22

Step by Step Solution

1. Step 1: Write the proportion equation
   80,498.39 : 111,049.18 = 56,638.22 : x
2. Step 2: Convert to fraction form
   80,498.39/111,049.18 = 56,638.22/x
3. Step 3: Cross multiply
   80,498.39x = 111,049.18 × 56,638.22
4. Step 4: Simplify right side
   80,498.39x = 6,289,627,190.82
5. Step 5: Solve for x
   x = 6,289,627,190.82/80,498.39
6. Step 6: Final answer
   x = 78,133.58