Finding the Fourth Proportional to 99.89, 149.73 and 51.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99.89 : 149.73 = 51.83 : x
2. Step 2: Convert to fraction form
   99.89/149.73 = 51.83/x
3. Step 3: Cross multiply
   99.89x = 149.73 × 51.83
4. Step 4: Simplify right side
   99.89x = 7,759.76
5. Step 5: Solve for x
   x = 7,759.76/99.89
6. Step 6: Final answer
   x = 77.69