Finding the Fourth Proportional to 105.69, 158.39 and 56.93

Step by Step Solution

1. Step 1: Write the proportion equation
   105.69 : 158.39 = 56.93 : x
2. Step 2: Convert to fraction form
   105.69/158.39 = 56.93/x
3. Step 3: Cross multiply
   105.69x = 158.39 × 56.93
4. Step 4: Simplify right side
   105.69x = 9,017.61
5. Step 5: Solve for x
   x = 9,017.61/105.69
6. Step 6: Final answer
   x = 85.32