Finding the Fourth Proportional to 104.52, 156.03 and 86.52

Step by Step Solution

1. Step 1: Write the proportion equation
   104.52 : 156.03 = 86.52 : x
2. Step 2: Convert to fraction form
   104.52/156.03 = 86.52/x
3. Step 3: Cross multiply
   104.52x = 156.03 × 86.52
4. Step 4: Simplify right side
   104.52x = 13,499.72
5. Step 5: Solve for x
   x = 13,499.72/104.52
6. Step 6: Final answer
   x = 129.16