Finding the Fourth Proportional to 116.47, 160.73 and 64.72

Step by Step Solution

1. Step 1: Write the proportion equation
   116.47 : 160.73 = 64.72 : x
2. Step 2: Convert to fraction form
   116.47/160.73 = 64.72/x
3. Step 3: Cross multiply
   116.47x = 160.73 × 64.72
4. Step 4: Simplify right side
   116.47x = 10,401.32
5. Step 5: Solve for x
   x = 10,401.32/116.47
6. Step 6: Final answer
   x = 89.31