Finding the Fourth Proportional to 99.39, 137.25 and 82.79

Step by Step Solution

1. Step 1: Write the proportion equation
   99.39 : 137.25 = 82.79 : x
2. Step 2: Convert to fraction form
   99.39/137.25 = 82.79/x
3. Step 3: Cross multiply
   99.39x = 137.25 × 82.79
4. Step 4: Simplify right side
   99.39x = 11,362.76
5. Step 5: Solve for x
   x = 11,362.76/99.39
6. Step 6: Final answer
   x = 114.32