Finding the Fourth Proportional to 105.71, 158.10 and 105.55

Step by Step Solution

1. Step 1: Write the proportion equation
   105.71 : 158.10 = 105.55 : x
2. Step 2: Convert to fraction form
   105.71/158.10 = 105.55/x
3. Step 3: Cross multiply
   105.71x = 158.10 × 105.55
4. Step 4: Simplify right side
   105.71x = 16,688.15
5. Step 5: Solve for x
   x = 16,688.15/105.71
6. Step 6: Final answer
   x = 157.87