Finding the Fourth Proportional to 99.83, 136.96 and 98.89

Step by Step Solution

1. Step 1: Write the proportion equation
   99.83 : 136.96 = 98.89 : x
2. Step 2: Convert to fraction form
   99.83/136.96 = 98.89/x
3. Step 3: Cross multiply
   99.83x = 136.96 × 98.89
4. Step 4: Simplify right side
   99.83x = 13,543.38
5. Step 5: Solve for x
   x = 13,543.38/99.83
6. Step 6: Final answer
   x = 135.66