Finding the Fourth Proportional to 116.72, 160.83 and 85.58

Step by Step Solution

1. Step 1: Write the proportion equation
   116.72 : 160.83 = 85.58 : x
2. Step 2: Convert to fraction form
   116.72/160.83 = 85.58/x
3. Step 3: Cross multiply
   116.72x = 160.83 × 85.58
4. Step 4: Simplify right side
   116.72x = 13,763.83
5. Step 5: Solve for x
   x = 13,763.83/116.72
6. Step 6: Final answer
   x = 117.92