Finding the Fourth Proportional to 80,789.34, 121,239.38 and 28,198.84

Step by Step Solution

1. Step 1: Write the proportion equation
   80,789.34 : 121,239.38 = 28,198.84 : x
2. Step 2: Convert to fraction form
   80,789.34/121,239.38 = 28,198.84/x
3. Step 3: Cross multiply
   80,789.34x = 121,239.38 × 28,198.84
4. Step 4: Simplify right side
   80,789.34x = 3,418,809,878.32
5. Step 5: Solve for x
   x = 3,418,809,878.32/80,789.34
6. Step 6: Final answer
   x = 42,317.59