Finding the Fourth Proportional to 111.32, 153.61 and 64.06

Step by Step Solution

1. Step 1: Write the proportion equation
   111.32 : 153.61 = 64.06 : x
2. Step 2: Convert to fraction form
   111.32/153.61 = 64.06/x
3. Step 3: Cross multiply
   111.32x = 153.61 × 64.06
4. Step 4: Simplify right side
   111.32x = 9,839.71
5. Step 5: Solve for x
   x = 9,839.71/111.32
6. Step 6: Final answer
   x = 88.40