Finding the Fourth Proportional to 80,123.31, 120,175.79 and 20,964.69

Step by Step Solution

1. Step 1: Write the proportion equation
   80,123.31 : 120,175.79 = 20,964.69 : x
2. Step 2: Convert to fraction form
   80,123.31/120,175.79 = 20,964.69/x
3. Step 3: Cross multiply
   80,123.31x = 120,175.79 × 20,964.69
4. Step 4: Simplify right side
   80,123.31x = 2,519,448,078.03
5. Step 5: Solve for x
   x = 2,519,448,078.03/80,123.31
6. Step 6: Final answer
   x = 31,444.63