Finding the Fourth Proportional to 99.91, 149.88 and 51.82

Step by Step Solution

1. Step 1: Write the proportion equation
   99.91 : 149.88 = 51.82 : x
2. Step 2: Convert to fraction form
   99.91/149.88 = 51.82/x
3. Step 3: Cross multiply
   99.91x = 149.88 × 51.82
4. Step 4: Simplify right side
   99.91x = 7,766.78
5. Step 5: Solve for x
   x = 7,766.78/99.91
6. Step 6: Final answer
   x = 77.74