Finding the Fourth Proportional to 116.46, 174.72 and 85.98

Step by Step Solution

1. Step 1: Write the proportion equation
   116.46 : 174.72 = 85.98 : x
2. Step 2: Convert to fraction form
   116.46/174.72 = 85.98/x
3. Step 3: Cross multiply
   116.46x = 174.72 × 85.98
4. Step 4: Simplify right side
   116.46x = 15,022.43
5. Step 5: Solve for x
   x = 15,022.43/116.46
6. Step 6: Final answer
   x = 128.99