Finding the Fourth Proportional to 99.79, 149.73 and 72.82

Step by Step Solution

1. Step 1: Write the proportion equation
   99.79 : 149.73 = 72.82 : x
2. Step 2: Convert to fraction form
   99.79/149.73 = 72.82/x
3. Step 3: Cross multiply
   99.79x = 149.73 × 72.82
4. Step 4: Simplify right side
   99.79x = 10,903.34
5. Step 5: Solve for x
   x = 10,903.34/99.79
6. Step 6: Final answer
   x = 109.26