Finding the Fourth Proportional to 86.01, 118.50 and 61.39

Step by Step Solution

1. Step 1: Write the proportion equation
   86.01 : 118.50 = 61.39 : x
2. Step 2: Convert to fraction form
   86.01/118.50 = 61.39/x
3. Step 3: Cross multiply
   86.01x = 118.50 × 61.39
4. Step 4: Simplify right side
   86.01x = 7,274.72
5. Step 5: Solve for x
   x = 7,274.72/86.01
6. Step 6: Final answer
   x = 84.58