Finding the Fourth Proportional to 100.71, 138.89 and 67.97

Step by Step Solution

1. Step 1: Write the proportion equation
   100.71 : 138.89 = 67.97 : x
2. Step 2: Convert to fraction form
   100.71/138.89 = 67.97/x
3. Step 3: Cross multiply
   100.71x = 138.89 × 67.97
4. Step 4: Simplify right side
   100.71x = 9,439.32
5. Step 5: Solve for x
   x = 9,439.32/100.71
6. Step 6: Final answer
   x = 93.73