Finding the Fourth Proportional to 101.15, 139.59 and 62.31

Step by Step Solution

1. Step 1: Write the proportion equation
   101.15 : 139.59 = 62.31 : x
2. Step 2: Convert to fraction form
   101.15/139.59 = 62.31/x
3. Step 3: Cross multiply
   101.15x = 139.59 × 62.31
4. Step 4: Simplify right side
   101.15x = 8,697.85
5. Step 5: Solve for x
   x = 8,697.85/101.15
6. Step 6: Final answer
   x = 85.99