Finding the Fourth Proportional to 99.35, 137.15 and 79.61

Step by Step Solution

1. Step 1: Write the proportion equation
   99.35 : 137.15 = 79.61 : x
2. Step 2: Convert to fraction form
   99.35/137.15 = 79.61/x
3. Step 3: Cross multiply
   99.35x = 137.15 × 79.61
4. Step 4: Simplify right side
   99.35x = 10,917.43
5. Step 5: Solve for x
   x = 10,917.43/99.35
6. Step 6: Final answer
   x = 109.89