Finding the Fourth Proportional to 123,083.96, 169,912.56 and 72,089.60

Step by Step Solution

1. Step 1: Write the proportion equation
   123,083.96 : 169,912.56 = 72,089.60 : x
2. Step 2: Convert to fraction form
   123,083.96/169,912.56 = 72,089.60/x
3. Step 3: Cross multiply
   123,083.96x = 169,912.56 × 72,089.60
4. Step 4: Simplify right side
   123,083.96x = 12,248,928,485.38
5. Step 5: Solve for x
   x = 12,248,928,485.38/123,083.96
6. Step 6: Final answer
   x = 99,516.85