Finding the Fourth Proportional to 100.52, 138.71 and 67.71

Step by Step Solution

1. Step 1: Write the proportion equation
   100.52 : 138.71 = 67.71 : x
2. Step 2: Convert to fraction form
   100.52/138.71 = 67.71/x
3. Step 3: Cross multiply
   100.52x = 138.71 × 67.71
4. Step 4: Simplify right side
   100.52x = 9,392.22
5. Step 5: Solve for x
   x = 9,392.22/100.52
6. Step 6: Final answer
   x = 93.44