Finding the Fourth Proportional to 97.10, 144.89 and 86.84

Step by Step Solution

1. Step 1: Write the proportion equation
   97.10 : 144.89 = 86.84 : x
2. Step 2: Convert to fraction form
   97.10/144.89 = 86.84/x
3. Step 3: Cross multiply
   97.10x = 144.89 × 86.84
4. Step 4: Simplify right side
   97.10x = 12,582.83
5. Step 5: Solve for x
   x = 12,582.83/97.10
6. Step 6: Final answer
   x = 129.59