Finding the Fourth Proportional to 72.69, 108.94 and 56.38

Step by Step Solution

1. Step 1: Write the proportion equation
   72.69 : 108.94 = 56.38 : x
2. Step 2: Convert to fraction form
   72.69/108.94 = 56.38/x
3. Step 3: Cross multiply
   72.69x = 108.94 × 56.38
4. Step 4: Simplify right side
   72.69x = 6,142.04
5. Step 5: Solve for x
   x = 6,142.04/72.69
6. Step 6: Final answer
   x = 84.50