Finding the Fourth Proportional to 108,811.78, 162,900.69 and 80,855.80

Step by Step Solution

1. Step 1: Write the proportion equation
   108,811.78 : 162,900.69 = 80,855.80 : x
2. Step 2: Convert to fraction form
   108,811.78/162,900.69 = 80,855.80/x
3. Step 3: Cross multiply
   108,811.78x = 162,900.69 × 80,855.80
4. Step 4: Simplify right side
   108,811.78x = 13,171,465,610.50
5. Step 5: Solve for x
   x = 13,171,465,610.50/108,811.78
6. Step 6: Final answer
   x = 121,048.16