Finding the Fourth Proportional to 105.91, 158.56 and 69.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105.91 : 158.56 = 69.76 : x
2. Step 2: Convert to fraction form
   105.91/158.56 = 69.76/x
3. Step 3: Cross multiply
   105.91x = 158.56 × 69.76
4. Step 4: Simplify right side
   105.91x = 11,061.17
5. Step 5: Solve for x
   x = 11,061.17/105.91
6. Step 6: Final answer
   x = 104.44