Finding the Fourth Proportional to 86.98, 119.97 and 59.31

Step by Step Solution

1. Step 1: Write the proportion equation
   86.98 : 119.97 = 59.31 : x
2. Step 2: Convert to fraction form
   86.98/119.97 = 59.31/x
3. Step 3: Cross multiply
   86.98x = 119.97 × 59.31
4. Step 4: Simplify right side
   86.98x = 7,114.82
5. Step 5: Solve for x
   x = 7,114.82/86.98
6. Step 6: Final answer
   x = 81.80