Finding the Fourth Proportional to 82.69, 123.91 and 59.91

Step by Step Solution

1. Step 1: Write the proportion equation
   82.69 : 123.91 = 59.91 : x
2. Step 2: Convert to fraction form
   82.69/123.91 = 59.91/x
3. Step 3: Cross multiply
   82.69x = 123.91 × 59.91
4. Step 4: Simplify right side
   82.69x = 7,423.15
5. Step 5: Solve for x
   x = 7,423.15/82.69
6. Step 6: Final answer
   x = 89.78