Finding the Fourth Proportional to 111.89, 154.41 and 62.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.89 : 154.41 = 62.10 : x
2. Step 2: Convert to fraction form
   111.89/154.41 = 62.10/x
3. Step 3: Cross multiply
   111.89x = 154.41 × 62.10
4. Step 4: Simplify right side
   111.89x = 9,588.86
5. Step 5: Solve for x
   x = 9,588.86/111.89
6. Step 6: Final answer
   x = 85.70