Finding the Fourth Proportional to 83.38, 124.82 and 78.18

Step by Step Solution

1. Step 1: Write the proportion equation
   83.38 : 124.82 = 78.18 : x
2. Step 2: Convert to fraction form
   83.38/124.82 = 78.18/x
3. Step 3: Cross multiply
   83.38x = 124.82 × 78.18
4. Step 4: Simplify right side
   83.38x = 9,757.82
5. Step 5: Solve for x
   x = 9,757.82/83.38
6. Step 6: Final answer
   x = 117.03