Finding the Fourth Proportional to 100.34, 138.42 and 67.61

Step by Step Solution

1. Step 1: Write the proportion equation
   100.34 : 138.42 = 67.61 : x
2. Step 2: Convert to fraction form
   100.34/138.42 = 67.61/x
3. Step 3: Cross multiply
   100.34x = 138.42 × 67.61
4. Step 4: Simplify right side
   100.34x = 9,357.88
5. Step 5: Solve for x
   x = 9,357.88/100.34
6. Step 6: Final answer
   x = 93.26