Finding the Fourth Proportional to 198,709.82, 274,078.56 and 122,128.37

Step by Step Solution

1. Step 1: Write the proportion equation
   198,709.82 : 274,078.56 = 122,128.37 : x
2. Step 2: Convert to fraction form
   198,709.82/274,078.56 = 122,128.37/x
3. Step 3: Cross multiply
   198,709.82x = 274,078.56 × 122,128.37
4. Step 4: Simplify right side
   198,709.82x = 33,472,769,098.34
5. Step 5: Solve for x
   x = 33,472,769,098.34/198,709.82
6. Step 6: Final answer
   x = 168,450.50