Finding the Fourth Proportional to 67.81, 101.58 and 53.30

Step by Step Solution

1. Step 1: Write the proportion equation
   67.81 : 101.58 = 53.30 : x
2. Step 2: Convert to fraction form
   67.81/101.58 = 53.30/x
3. Step 3: Cross multiply
   67.81x = 101.58 × 53.30
4. Step 4: Simplify right side
   67.81x = 5,414.02
5. Step 5: Solve for x
   x = 5,414.02/67.81
6. Step 6: Final answer
   x = 79.84