Finding the Fourth Proportional to 80,749.69, 121,123.45 and 28,159

Step by Step Solution

1. Step 1: Write the proportion equation
   80,749.69 : 121,123.45 = 28,159 : x
2. Step 2: Convert to fraction form
   80,749.69/121,123.45 = 28,159/x
3. Step 3: Cross multiply
   80,749.69x = 121,123.45 × 28,159
4. Step 4: Simplify right side
   80,749.69x = 3,410,715,228.55
5. Step 5: Solve for x
   x = 3,410,715,228.55/80,749.69
6. Step 6: Final answer
   x = 42,238.12