Finding the Fourth Proportional to 104.69, 156.83 and 72.18

Step by Step Solution

1. Step 1: Write the proportion equation
   104.69 : 156.83 = 72.18 : x
2. Step 2: Convert to fraction form
   104.69/156.83 = 72.18/x
3. Step 3: Cross multiply
   104.69x = 156.83 × 72.18
4. Step 4: Simplify right side
   104.69x = 11,319.63
5. Step 5: Solve for x
   x = 11,319.63/104.69
6. Step 6: Final answer
   x = 108.13