Finding the Fourth Proportional to 67.19, 100.71 and 52.61

Step by Step Solution

1. Step 1: Write the proportion equation
   67.19 : 100.71 = 52.61 : x
2. Step 2: Convert to fraction form
   67.19/100.71 = 52.61/x
3. Step 3: Cross multiply
   67.19x = 100.71 × 52.61
4. Step 4: Simplify right side
   67.19x = 5,298.35
5. Step 5: Solve for x
   x = 5,298.35/67.19
6. Step 6: Final answer
   x = 78.86