Finding the Fourth Proportional to 72.56, 109.60 and 72.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72.56 : 109.60 = 72.56 : x
2. Step 2: Convert to fraction form
   72.56/109.60 = 72.56/x
3. Step 3: Cross multiply
   72.56x = 109.60 × 72.56
4. Step 4: Simplify right side
   72.56x = 7,952.58
5. Step 5: Solve for x
   x = 7,952.58/72.56
6. Step 6: Final answer
   x = 109.60