Finding the Fourth Proportional to 89.15, 123.05 and 83.07

Step by Step Solution

1. Step 1: Write the proportion equation
   89.15 : 123.05 = 83.07 : x
2. Step 2: Convert to fraction form
   89.15/123.05 = 83.07/x
3. Step 3: Cross multiply
   89.15x = 123.05 × 83.07
4. Step 4: Simplify right side
   89.15x = 10,221.76
5. Step 5: Solve for x
   x = 10,221.76/89.15
6. Step 6: Final answer
   x = 114.66