Finding the Fourth Proportional to 100.82, 150.99 and 99.86

Step by Step Solution

1. Step 1: Write the proportion equation
   100.82 : 150.99 = 99.86 : x
2. Step 2: Convert to fraction form
   100.82/150.99 = 99.86/x
3. Step 3: Cross multiply
   100.82x = 150.99 × 99.86
4. Step 4: Simplify right side
   100.82x = 15,077.86
5. Step 5: Solve for x
   x = 15,077.86/100.82
6. Step 6: Final answer
   x = 149.55