Finding the Fourth Proportional to 111.31, 153.62 and 67.64

Step by Step Solution

1. Step 1: Write the proportion equation
   111.31 : 153.62 = 67.64 : x
2. Step 2: Convert to fraction form
   111.31/153.62 = 67.64/x
3. Step 3: Cross multiply
   111.31x = 153.62 × 67.64
4. Step 4: Simplify right side
   111.31x = 10,390.90
5. Step 5: Solve for x
   x = 10,390.90/111.31
6. Step 6: Final answer
   x = 93.35