Finding the Fourth Proportional to 111.56, 153.98 and 67.90

Step by Step Solution

1. Step 1: Write the proportion equation
   111.56 : 153.98 = 67.90 : x
2. Step 2: Convert to fraction form
   111.56/153.98 = 67.90/x
3. Step 3: Cross multiply
   111.56x = 153.98 × 67.90
4. Step 4: Simplify right side
   111.56x = 10,455.24
5. Step 5: Solve for x
   x = 10,455.24/111.56
6. Step 6: Final answer
   x = 93.72