Finding the Fourth Proportional to 72.08, 108.86 and 72.08

Step by Step Solution

1. Step 1: Write the proportion equation
   72.08 : 108.86 = 72.08 : x
2. Step 2: Convert to fraction form
   72.08/108.86 = 72.08/x
3. Step 3: Cross multiply
   72.08x = 108.86 × 72.08
4. Step 4: Simplify right side
   72.08x = 7,846.63
5. Step 5: Solve for x
   x = 7,846.63/72.08
6. Step 6: Final answer
   x = 108.86