Finding the Fourth Proportional to 111.57, 153.93 and 67.90

Step by Step Solution

1. Step 1: Write the proportion equation
   111.57 : 153.93 = 67.90 : x
2. Step 2: Convert to fraction form
   111.57/153.93 = 67.90/x
3. Step 3: Cross multiply
   111.57x = 153.93 × 67.90
4. Step 4: Simplify right side
   111.57x = 10,451.85
5. Step 5: Solve for x
   x = 10,451.85/111.57
6. Step 6: Final answer
   x = 93.68