Finding the Fourth Proportional to 111.50, 153.86 and 62.39

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 153.86 = 62.39 : x
2. Step 2: Convert to fraction form
   111.50/153.86 = 62.39/x
3. Step 3: Cross multiply
   111.50x = 153.86 × 62.39
4. Step 4: Simplify right side
   111.50x = 9,598.71
5. Step 5: Solve for x
   x = 9,598.71/111.50
6. Step 6: Final answer
   x = 86.09