Finding the Fourth Proportional to 99.37, 149.05 and 71.98

Step by Step Solution

1. Step 1: Write the proportion equation
   99.37 : 149.05 = 71.98 : x
2. Step 2: Convert to fraction form
   99.37/149.05 = 71.98/x
3. Step 3: Cross multiply
   99.37x = 149.05 × 71.98
4. Step 4: Simplify right side
   99.37x = 10,728.34
5. Step 5: Solve for x
   x = 10,728.34/99.37
6. Step 6: Final answer
   x = 107.96