Finding the Fourth Proportional to 99.91, 149.91 and 45.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99.91 : 149.91 = 45.83 : x
2. Step 2: Convert to fraction form
   99.91/149.91 = 45.83/x
3. Step 3: Cross multiply
   99.91x = 149.91 × 45.83
4. Step 4: Simplify right side
   99.91x = 6,870.15
5. Step 5: Solve for x
   x = 6,870.15/99.91
6. Step 6: Final answer
   x = 68.76