Finding the Fourth Proportional to 104.43, 156.69 and 86.52

Step by Step Solution

1. Step 1: Write the proportion equation
   104.43 : 156.69 = 86.52 : x
2. Step 2: Convert to fraction form
   104.43/156.69 = 86.52/x
3. Step 3: Cross multiply
   104.43x = 156.69 × 86.52
4. Step 4: Simplify right side
   104.43x = 13,556.82
5. Step 5: Solve for x
   x = 13,556.82/104.43
6. Step 6: Final answer
   x = 129.82