Finding the Fourth Proportional to 67.39, 100.99 and 52.90

Step by Step Solution

1. Step 1: Write the proportion equation
   67.39 : 100.99 = 52.90 : x
2. Step 2: Convert to fraction form
   67.39/100.99 = 52.90/x
3. Step 3: Cross multiply
   67.39x = 100.99 × 52.90
4. Step 4: Simplify right side
   67.39x = 5,342.37
5. Step 5: Solve for x
   x = 5,342.37/67.39
6. Step 6: Final answer
   x = 79.28