Finding the Fourth Proportional to 83.98, 126.06 and 67.72

Step by Step Solution

1. Step 1: Write the proportion equation
   83.98 : 126.06 = 67.72 : x
2. Step 2: Convert to fraction form
   83.98/126.06 = 67.72/x
3. Step 3: Cross multiply
   83.98x = 126.06 × 67.72
4. Step 4: Simplify right side
   83.98x = 8,536.78
5. Step 5: Solve for x
   x = 8,536.78/83.98
6. Step 6: Final answer
   x = 101.65