Finding the Fourth Proportional to 120,271.62, 166,111.90 and 81,965.10

Step by Step Solution

1. Step 1: Write the proportion equation
   120,271.62 : 166,111.90 = 81,965.10 : x
2. Step 2: Convert to fraction form
   120,271.62/166,111.90 = 81,965.10/x
3. Step 3: Cross multiply
   120,271.62x = 166,111.90 × 81,965.10
4. Step 4: Simplify right side
   120,271.62x = 13,615,378,494.69
5. Step 5: Solve for x
   x = 13,615,378,494.69/120,271.62
6. Step 6: Final answer
   x = 113,205.25