Finding the Fourth Proportional to 101.72, 152.89 and 99.42

Step by Step Solution

1. Step 1: Write the proportion equation
   101.72 : 152.89 = 99.42 : x
2. Step 2: Convert to fraction form
   101.72/152.89 = 99.42/x
3. Step 3: Cross multiply
   101.72x = 152.89 × 99.42
4. Step 4: Simplify right side
   101.72x = 15,200.32
5. Step 5: Solve for x
   x = 15,200.32/101.72
6. Step 6: Final answer
   x = 149.43