Finding the Fourth Proportional to 67.10, 100.61 and 21.47

Step by Step Solution

1. Step 1: Write the proportion equation
   67.10 : 100.61 = 21.47 : x
2. Step 2: Convert to fraction form
   67.10/100.61 = 21.47/x
3. Step 3: Cross multiply
   67.10x = 100.61 × 21.47
4. Step 4: Simplify right side
   67.10x = 2,159.57
5. Step 5: Solve for x
   x = 2,159.57/67.10
6. Step 6: Final answer
   x = 32.18