Finding the Fourth Proportional to 67.34, 100.80 and 42.99

Step by Step Solution

1. Step 1: Write the proportion equation
   67.34 : 100.80 = 42.99 : x
2. Step 2: Convert to fraction form
   67.34/100.80 = 42.99/x
3. Step 3: Cross multiply
   67.34x = 100.80 × 42.99
4. Step 4: Simplify right side
   67.34x = 4,332.78
5. Step 5: Solve for x
   x = 4,332.78/67.34
6. Step 6: Final answer
   x = 64.34