Finding the Fourth Proportional to 70.55, 105.78 and 56.06

Step by Step Solution

1. Step 1: Write the proportion equation
   70.55 : 105.78 = 56.06 : x
2. Step 2: Convert to fraction form
   70.55/105.78 = 56.06/x
3. Step 3: Cross multiply
   70.55x = 105.78 × 56.06
4. Step 4: Simplify right side
   70.55x = 5,930.10
5. Step 5: Solve for x
   x = 5,930.10/70.55
6. Step 6: Final answer
   x = 84.06