Finding the Fourth Proportional to 70.76, 105.98 and 38.18

Step by Step Solution

1. Step 1: Write the proportion equation
   70.76 : 105.98 = 38.18 : x
2. Step 2: Convert to fraction form
   70.76/105.98 = 38.18/x
3. Step 3: Cross multiply
   70.76x = 105.98 × 38.18
4. Step 4: Simplify right side
   70.76x = 4,046.32
5. Step 5: Solve for x
   x = 4,046.32/70.76
6. Step 6: Final answer
   x = 57.18