Finding the Fourth Proportional to 123,120.16, 169,906.40 and 72,141.96

Step by Step Solution

1. Step 1: Write the proportion equation
   123,120.16 : 169,906.40 = 72,141.96 : x
2. Step 2: Convert to fraction form
   123,120.16/169,906.40 = 72,141.96/x
3. Step 3: Cross multiply
   123,120.16x = 169,906.40 × 72,141.96
4. Step 4: Simplify right side
   123,120.16x = 12,257,380,712.54
5. Step 5: Solve for x
   x = 12,257,380,712.54/123,120.16
6. Step 6: Final answer
   x = 99,556.24