Finding the Fourth Proportional to 116.36, 160.69 and 99.89

Step by Step Solution

1. Step 1: Write the proportion equation
   116.36 : 160.69 = 99.89 : x
2. Step 2: Convert to fraction form
   116.36/160.69 = 99.89/x
3. Step 3: Cross multiply
   116.36x = 160.69 × 99.89
4. Step 4: Simplify right side
   116.36x = 16,050.82
5. Step 5: Solve for x
   x = 16,050.82/116.36
6. Step 6: Final answer
   x = 137.94