Finding the Fourth Proportional to 122,131.80, 168,544.80 and 81,818.10

Step by Step Solution

1. Step 1: Write the proportion equation
   122,131.80 : 168,544.80 = 81,818.10 : x
2. Step 2: Convert to fraction form
   122,131.80/168,544.80 = 81,818.10/x
3. Step 3: Cross multiply
   122,131.80x = 168,544.80 × 81,818.10
4. Step 4: Simplify right side
   122,131.80x = 13,790,015,300.88
5. Step 5: Solve for x
   x = 13,790,015,300.88/122,131.80
6. Step 6: Final answer
   x = 112,910.93