Finding the Fourth Proportional to 99.69, 149.52 and 31.21

Step by Step Solution

1. Step 1: Write the proportion equation
   99.69 : 149.52 = 31.21 : x
2. Step 2: Convert to fraction form
   99.69/149.52 = 31.21/x
3. Step 3: Cross multiply
   99.69x = 149.52 × 31.21
4. Step 4: Simplify right side
   99.69x = 4,665.77
5. Step 5: Solve for x
   x = 4,665.77/99.69
6. Step 6: Final answer
   x = 46.81