Finding the Fourth Proportional to 99.96, 149.89 and 42.21

Step by Step Solution

1. Step 1: Write the proportion equation
   99.96 : 149.89 = 42.21 : x
2. Step 2: Convert to fraction form
   99.96/149.89 = 42.21/x
3. Step 3: Cross multiply
   99.96x = 149.89 × 42.21
4. Step 4: Simplify right side
   99.96x = 6,326.86
5. Step 5: Solve for x
   x = 6,326.86/99.96
6. Step 6: Final answer
   x = 63.29