Finding the Fourth Proportional to 67.10, 100.74 and 43.10

Step by Step Solution

1. Step 1: Write the proportion equation
   67.10 : 100.74 = 43.10 : x
2. Step 2: Convert to fraction form
   67.10/100.74 = 43.10/x
3. Step 3: Cross multiply
   67.10x = 100.74 × 43.10
4. Step 4: Simplify right side
   67.10x = 4,341.89
5. Step 5: Solve for x
   x = 4,341.89/67.10
6. Step 6: Final answer
   x = 64.71