Finding the Fourth Proportional to 111.56, 153.62 and 85.32

Step by Step Solution

1. Step 1: Write the proportion equation
   111.56 : 153.62 = 85.32 : x
2. Step 2: Convert to fraction form
   111.56/153.62 = 85.32/x
3. Step 3: Cross multiply
   111.56x = 153.62 × 85.32
4. Step 4: Simplify right side
   111.56x = 13,106.86
5. Step 5: Solve for x
   x = 13,106.86/111.56
6. Step 6: Final answer
   x = 117.49