Finding the Fourth Proportional to 131,020.72, 180,815 and 73,678.09

Step by Step Solution

1. Step 1: Write the proportion equation
   131,020.72 : 180,815 = 73,678.09 : x
2. Step 2: Convert to fraction form
   131,020.72/180,815 = 73,678.09/x
3. Step 3: Cross multiply
   131,020.72x = 180,815 × 73,678.09
4. Step 4: Simplify right side
   131,020.72x = 13,322,103,843.35
5. Step 5: Solve for x
   x = 13,322,103,843.35/131,020.72
6. Step 6: Final answer
   x = 101,679.37