Finding the Fourth Proportional to 67.32, 100.98 and 57.78

Step by Step Solution

1. Step 1: Write the proportion equation
   67.32 : 100.98 = 57.78 : x
2. Step 2: Convert to fraction form
   67.32/100.98 = 57.78/x
3. Step 3: Cross multiply
   67.32x = 100.98 × 57.78
4. Step 4: Simplify right side
   67.32x = 5,834.62
5. Step 5: Solve for x
   x = 5,834.62/67.32
6. Step 6: Final answer
   x = 86.67