Finding the Fourth Proportional to 104.52, 155.98 and 86.52

Step by Step Solution

1. Step 1: Write the proportion equation
   104.52 : 155.98 = 86.52 : x
2. Step 2: Convert to fraction form
   104.52/155.98 = 86.52/x
3. Step 3: Cross multiply
   104.52x = 155.98 × 86.52
4. Step 4: Simplify right side
   104.52x = 13,495.39
5. Step 5: Solve for x
   x = 13,495.39/104.52
6. Step 6: Final answer
   x = 129.12