Finding the Fourth Proportional to 86.58, 119.98 and 83.39

Step by Step Solution

1. Step 1: Write the proportion equation
   86.58 : 119.98 = 83.39 : x
2. Step 2: Convert to fraction form
   86.58/119.98 = 83.39/x
3. Step 3: Cross multiply
   86.58x = 119.98 × 83.39
4. Step 4: Simplify right side
   86.58x = 10,004.32
5. Step 5: Solve for x
   x = 10,004.32/86.58
6. Step 6: Final answer
   x = 115.55