Finding the Fourth Proportional to 105.30, 156.84 and 88.69

Step by Step Solution

1. Step 1: Write the proportion equation
   105.30 : 156.84 = 88.69 : x
2. Step 2: Convert to fraction form
   105.30/156.84 = 88.69/x
3. Step 3: Cross multiply
   105.30x = 156.84 × 88.69
4. Step 4: Simplify right side
   105.30x = 13,910.14
5. Step 5: Solve for x
   x = 13,910.14/105.30
6. Step 6: Final answer
   x = 132.10