Finding the Fourth Proportional to 104.10, 156.15 and 68.10

Step by Step Solution

1. Step 1: Write the proportion equation
   104.10 : 156.15 = 68.10 : x
2. Step 2: Convert to fraction form
   104.10/156.15 = 68.10/x
3. Step 3: Cross multiply
   104.10x = 156.15 × 68.10
4. Step 4: Simplify right side
   104.10x = 10,633.82
5. Step 5: Solve for x
   x = 10,633.82/104.10
6. Step 6: Final answer
   x = 102.15