Finding the Fourth Proportional to 99.83, 136.57 and 99.43

Step by Step Solution

1. Step 1: Write the proportion equation
   99.83 : 136.57 = 99.43 : x
2. Step 2: Convert to fraction form
   99.83/136.57 = 99.43/x
3. Step 3: Cross multiply
   99.83x = 136.57 × 99.43
4. Step 4: Simplify right side
   99.83x = 13,578.75
5. Step 5: Solve for x
   x = 13,578.75/99.83
6. Step 6: Final answer
   x = 136.02