Finding the Fourth Proportional to 89.88, 124.10 and 83.30

Step by Step Solution

1. Step 1: Write the proportion equation
   89.88 : 124.10 = 83.30 : x
2. Step 2: Convert to fraction form
   89.88/124.10 = 83.30/x
3. Step 3: Cross multiply
   89.88x = 124.10 × 83.30
4. Step 4: Simplify right side
   89.88x = 10,336.49
5. Step 5: Solve for x
   x = 10,336.49/89.88
6. Step 6: Final answer
   x = 115.00