Finding the Fourth Proportional to 67.89, 93.63 and 53.31

Step by Step Solution

1. Step 1: Write the proportion equation
   67.89 : 93.63 = 53.31 : x
2. Step 2: Convert to fraction form
   67.89/93.63 = 53.31/x
3. Step 3: Cross multiply
   67.89x = 93.63 × 53.31
4. Step 4: Simplify right side
   67.89x = 4,991.42
5. Step 5: Solve for x
   x = 4,991.42/67.89
6. Step 6: Final answer
   x = 73.52