Finding the Fourth Proportional to 73.72, 109.89 and 64.76

Step by Step Solution

1. Step 1: Write the proportion equation
   73.72 : 109.89 = 64.76 : x
2. Step 2: Convert to fraction form
   73.72/109.89 = 64.76/x
3. Step 3: Cross multiply
   73.72x = 109.89 × 64.76
4. Step 4: Simplify right side
   73.72x = 7,116.48
5. Step 5: Solve for x
   x = 7,116.48/73.72
6. Step 6: Final answer
   x = 96.53