Finding the Fourth Proportional to 106.43, 146.78 and 62.72

Step by Step Solution

1. Step 1: Write the proportion equation
   106.43 : 146.78 = 62.72 : x
2. Step 2: Convert to fraction form
   106.43/146.78 = 62.72/x
3. Step 3: Cross multiply
   106.43x = 146.78 × 62.72
4. Step 4: Simplify right side
   106.43x = 9,205.78
5. Step 5: Solve for x
   x = 9,205.78/106.43
6. Step 6: Final answer
   x = 86.50