Finding the Fourth Proportional to 123,072.96, 170,142.24 and 121,949.76

Step by Step Solution

1. Step 1: Write the proportion equation
   123,072.96 : 170,142.24 = 121,949.76 : x
2. Step 2: Convert to fraction form
   123,072.96/170,142.24 = 121,949.76/x
3. Step 3: Cross multiply
   123,072.96x = 170,142.24 × 121,949.76
4. Step 4: Simplify right side
   123,072.96x = 20,748,805,333.86
5. Step 5: Solve for x
   x = 20,748,805,333.86/123,072.96
6. Step 6: Final answer
   x = 168,589.47