Finding the Fourth Proportional to 72.06, 108.12 and 55.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72.06 : 108.12 = 55.05 : x
2. Step 2: Convert to fraction form
   72.06/108.12 = 55.05/x
3. Step 3: Cross multiply
   72.06x = 108.12 × 55.05
4. Step 4: Simplify right side
   72.06x = 5,952.01
5. Step 5: Solve for x
   x = 5,952.01/72.06
6. Step 6: Final answer
   x = 82.60