Finding the Fourth Proportional to 104.17, 156.05 and 78.52

Step by Step Solution

1. Step 1: Write the proportion equation
   104.17 : 156.05 = 78.52 : x
2. Step 2: Convert to fraction form
   104.17/156.05 = 78.52/x
3. Step 3: Cross multiply
   104.17x = 156.05 × 78.52
4. Step 4: Simplify right side
   104.17x = 12,253.05
5. Step 5: Solve for x
   x = 12,253.05/104.17
6. Step 6: Final answer
   x = 117.63