Finding the Fourth Proportional to 70.69, 105.94 and 54.38

Step by Step Solution

1. Step 1: Write the proportion equation
   70.69 : 105.94 = 54.38 : x
2. Step 2: Convert to fraction form
   70.69/105.94 = 54.38/x
3. Step 3: Cross multiply
   70.69x = 105.94 × 54.38
4. Step 4: Simplify right side
   70.69x = 5,761.02
5. Step 5: Solve for x
   x = 5,761.02/70.69
6. Step 6: Final answer
   x = 81.50