Finding the Fourth Proportional to 99.76, 137.71 and 70.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99.76 : 137.71 = 70.72 : x
2. Step 2: Convert to fraction form
   99.76/137.71 = 70.72/x
3. Step 3: Cross multiply
   99.76x = 137.71 × 70.72
4. Step 4: Simplify right side
   99.76x = 9,738.85
5. Step 5: Solve for x
   x = 9,738.85/99.76
6. Step 6: Final answer
   x = 97.62