Finding the Fourth Proportional to 123,280.45, 170,131.85 and 72,286.09

Step by Step Solution

1. Step 1: Write the proportion equation
   123,280.45 : 170,131.85 = 72,286.09 : x
2. Step 2: Convert to fraction form
   123,280.45/170,131.85 = 72,286.09/x
3. Step 3: Cross multiply
   123,280.45x = 170,131.85 × 72,286.09
4. Step 4: Simplify right side
   123,280.45x = 12,298,165,859.54
5. Step 5: Solve for x
   x = 12,298,165,859.54/123,280.45
6. Step 6: Final answer
   x = 99,757.63