Finding the Fourth Proportional to 105.50, 145.55 and 70.56

Step by Step Solution

1. Step 1: Write the proportion equation
   105.50 : 145.55 = 70.56 : x
2. Step 2: Convert to fraction form
   105.50/145.55 = 70.56/x
3. Step 3: Cross multiply
   105.50x = 145.55 × 70.56
4. Step 4: Simplify right side
   105.50x = 10,270.18
5. Step 5: Solve for x
   x = 10,270.18/105.50
6. Step 6: Final answer
   x = 97.35