Finding the Fourth Proportional to 113.62, 156.72 and 69.88

Step by Step Solution

1. Step 1: Write the proportion equation
   113.62 : 156.72 = 69.88 : x
2. Step 2: Convert to fraction form
   113.62/156.72 = 69.88/x
3. Step 3: Cross multiply
   113.62x = 156.72 × 69.88
4. Step 4: Simplify right side
   113.62x = 10,951.59
5. Step 5: Solve for x
   x = 10,951.59/113.62
6. Step 6: Final answer
   x = 96.39