Finding the Fourth Proportional to 275.69, 413.61 and 83.31

Step by Step Solution

1. Step 1: Write the proportion equation
   275.69 : 413.61 = 83.31 : x
2. Step 2: Convert to fraction form
   275.69/413.61 = 83.31/x
3. Step 3: Cross multiply
   275.69x = 413.61 × 83.31
4. Step 4: Simplify right side
   275.69x = 34,457.85
5. Step 5: Solve for x
   x = 34,457.85/275.69
6. Step 6: Final answer
   x = 124.99