Finding the Fourth Proportional to 67.60, 100.82 and 61.12

Step by Step Solution

1. Step 1: Write the proportion equation
   67.60 : 100.82 = 61.12 : x
2. Step 2: Convert to fraction form
   67.60/100.82 = 61.12/x
3. Step 3: Cross multiply
   67.60x = 100.82 × 61.12
4. Step 4: Simplify right side
   67.60x = 6,162.12
5. Step 5: Solve for x
   x = 6,162.12/67.60
6. Step 6: Final answer
   x = 91.16