Finding the Fourth Proportional to 116.76, 161.34 and 111.15

Step by Step Solution

1. Step 1: Write the proportion equation
   116.76 : 161.34 = 111.15 : x
2. Step 2: Convert to fraction form
   116.76/161.34 = 111.15/x
3. Step 3: Cross multiply
   116.76x = 161.34 × 111.15
4. Step 4: Simplify right side
   116.76x = 17,932.94
5. Step 5: Solve for x
   x = 17,932.94/116.76
6. Step 6: Final answer
   x = 153.59