Finding the Fourth Proportional to 67.50, 92.88 and 59.31

Step by Step Solution

1. Step 1: Write the proportion equation
   67.50 : 92.88 = 59.31 : x
2. Step 2: Convert to fraction form
   67.50/92.88 = 59.31/x
3. Step 3: Cross multiply
   67.50x = 92.88 × 59.31
4. Step 4: Simplify right side
   67.50x = 5,508.71
5. Step 5: Solve for x
   x = 5,508.71/67.50
6. Step 6: Final answer
   x = 81.61