Finding the Fourth Proportional to 82.86, 123.50 and 79.80

Step by Step Solution

1. Step 1: Write the proportion equation
   82.86 : 123.50 = 79.80 : x
2. Step 2: Convert to fraction form
   82.86/123.50 = 79.80/x
3. Step 3: Cross multiply
   82.86x = 123.50 × 79.80
4. Step 4: Simplify right side
   82.86x = 9,854.90
5. Step 5: Solve for x
   x = 9,854.90/82.86
6. Step 6: Final answer
   x = 118.93