Finding the Fourth Proportional to 83.07, 123.59 and 80.10

Step by Step Solution

1. Step 1: Write the proportion equation
   83.07 : 123.59 = 80.10 : x
2. Step 2: Convert to fraction form
   83.07/123.59 = 80.10/x
3. Step 3: Cross multiply
   83.07x = 123.59 × 80.10
4. Step 4: Simplify right side
   83.07x = 9,899.76
5. Step 5: Solve for x
   x = 9,899.76/83.07
6. Step 6: Final answer
   x = 119.17