Finding the Fourth Proportional to 99.86, 149.68 and 38.12

Step by Step Solution

1. Step 1: Write the proportion equation
   99.86 : 149.68 = 38.12 : x
2. Step 2: Convert to fraction form
   99.86/149.68 = 38.12/x
3. Step 3: Cross multiply
   99.86x = 149.68 × 38.12
4. Step 4: Simplify right side
   99.86x = 5,705.89
5. Step 5: Solve for x
   x = 5,705.89/99.86
6. Step 6: Final answer
   x = 57.14