Finding the Fourth Proportional to 104.83, 158.02 and 86.91

Step by Step Solution

1. Step 1: Write the proportion equation
   104.83 : 158.02 = 86.91 : x
2. Step 2: Convert to fraction form
   104.83/158.02 = 86.91/x
3. Step 3: Cross multiply
   104.83x = 158.02 × 86.91
4. Step 4: Simplify right side
   104.83x = 13,732.71
5. Step 5: Solve for x
   x = 13,732.71/104.83
6. Step 6: Final answer
   x = 131.00