Finding the Fourth Proportional to 71.63, 107.54 and 67.89

Step by Step Solution

1. Step 1: Write the proportion equation
   71.63 : 107.54 = 67.89 : x
2. Step 2: Convert to fraction form
   71.63/107.54 = 67.89/x
3. Step 3: Cross multiply
   71.63x = 107.54 × 67.89
4. Step 4: Simplify right side
   71.63x = 7,300.55
5. Step 5: Solve for x
   x = 7,300.55/71.63
6. Step 6: Final answer
   x = 101.93