Finding the Fourth Proportional to 116.06, 160.17 and 64.31

Step by Step Solution

1. Step 1: Write the proportion equation
   116.06 : 160.17 = 64.31 : x
2. Step 2: Convert to fraction form
   116.06/160.17 = 64.31/x
3. Step 3: Cross multiply
   116.06x = 160.17 × 64.31
4. Step 4: Simplify right side
   116.06x = 10,300.93
5. Step 5: Solve for x
   x = 10,300.93/116.06
6. Step 6: Final answer
   x = 88.75