Finding the Fourth Proportional to 99.72, 149.57 and 67.86

Step by Step Solution

1. Step 1: Write the proportion equation
   99.72 : 149.57 = 67.86 : x
2. Step 2: Convert to fraction form
   99.72/149.57 = 67.86/x
3. Step 3: Cross multiply
   99.72x = 149.57 × 67.86
4. Step 4: Simplify right side
   99.72x = 10,149.82
5. Step 5: Solve for x
   x = 10,149.82/99.72
6. Step 6: Final answer
   x = 101.78