Finding the Fourth Proportional to 67.10, 100.71 and 61.22

Step by Step Solution

1. Step 1: Write the proportion equation
   67.10 : 100.71 = 61.22 : x
2. Step 2: Convert to fraction form
   67.10/100.71 = 61.22/x
3. Step 3: Cross multiply
   67.10x = 100.71 × 61.22
4. Step 4: Simplify right side
   67.10x = 6,165.47
5. Step 5: Solve for x
   x = 6,165.47/67.10
6. Step 6: Final answer
   x = 91.88