Finding the Fourth Proportional to 99.98, 149.94 and 51.86

Step by Step Solution

1. Step 1: Write the proportion equation
   99.98 : 149.94 = 51.86 : x
2. Step 2: Convert to fraction form
   99.98/149.94 = 51.86/x
3. Step 3: Cross multiply
   99.98x = 149.94 × 51.86
4. Step 4: Simplify right side
   99.98x = 7,775.89
5. Step 5: Solve for x
   x = 7,775.89/99.98
6. Step 6: Final answer
   x = 77.77