Finding the Fourth Proportional to 82.18, 113.43 and 67.78

Step by Step Solution

1. Step 1: Write the proportion equation
   82.18 : 113.43 = 67.78 : x
2. Step 2: Convert to fraction form
   82.18/113.43 = 67.78/x
3. Step 3: Cross multiply
   82.18x = 113.43 × 67.78
4. Step 4: Simplify right side
   82.18x = 7,688.29
5. Step 5: Solve for x
   x = 7,688.29/82.18
6. Step 6: Final answer
   x = 93.55