Finding the Fourth Proportional to 131,787, 197,292.78 and 81,706.32

Step by Step Solution

1. Step 1: Write the proportion equation
   131,787 : 197,292.78 = 81,706.32 : x
2. Step 2: Convert to fraction form
   131,787/197,292.78 = 81,706.32/x
3. Step 3: Cross multiply
   131,787x = 197,292.78 × 81,706.32
4. Step 4: Simplify right side
   131,787x = 16,120,067,016.37
5. Step 5: Solve for x
   x = 16,120,067,016.37/131,787
6. Step 6: Final answer
   x = 122,319.10