Finding the Fourth Proportional to 111.55, 153.90 and 67.87

Step by Step Solution

1. Step 1: Write the proportion equation
   111.55 : 153.90 = 67.87 : x
2. Step 2: Convert to fraction form
   111.55/153.90 = 67.87/x
3. Step 3: Cross multiply
   111.55x = 153.90 × 67.87
4. Step 4: Simplify right side
   111.55x = 10,445.19
5. Step 5: Solve for x
   x = 10,445.19/111.55
6. Step 6: Final answer
   x = 93.64