Finding the Fourth Proportional to 67.06, 100.12 and 56.12

Step by Step Solution

1. Step 1: Write the proportion equation
   67.06 : 100.12 = 56.12 : x
2. Step 2: Convert to fraction form
   67.06/100.12 = 56.12/x
3. Step 3: Cross multiply
   67.06x = 100.12 × 56.12
4. Step 4: Simplify right side
   67.06x = 5,618.73
5. Step 5: Solve for x
   x = 5,618.73/67.06
6. Step 6: Final answer
   x = 83.79