Finding the Fourth Proportional to 83.02, 123.68 and 79.15

Step by Step Solution

1. Step 1: Write the proportion equation
   83.02 : 123.68 = 79.15 : x
2. Step 2: Convert to fraction form
   83.02/123.68 = 79.15/x
3. Step 3: Cross multiply
   83.02x = 123.68 × 79.15
4. Step 4: Simplify right side
   83.02x = 9,789.27
5. Step 5: Solve for x
   x = 9,789.27/83.02
6. Step 6: Final answer
   x = 117.91