Finding the Fourth Proportional to 67.89, 93.62 and 64.05

Step by Step Solution

1. Step 1: Write the proportion equation
   67.89 : 93.62 = 64.05 : x
2. Step 2: Convert to fraction form
   67.89/93.62 = 64.05/x
3. Step 3: Cross multiply
   67.89x = 93.62 × 64.05
4. Step 4: Simplify right side
   67.89x = 5,996.17
5. Step 5: Solve for x
   x = 5,996.17/67.89
6. Step 6: Final answer
   x = 88.32