Finding the Fourth Proportional to 113.69, 156.88 and 64.56

Step by Step Solution

1. Step 1: Write the proportion equation
   113.69 : 156.88 = 64.56 : x
2. Step 2: Convert to fraction form
   113.69/156.88 = 64.56/x
3. Step 3: Cross multiply
   113.69x = 156.88 × 64.56
4. Step 4: Simplify right side
   113.69x = 10,128.01
5. Step 5: Solve for x
   x = 10,128.01/113.69
6. Step 6: Final answer
   x = 89.09