Finding the Fourth Proportional to 100.72, 138.94 and 69.59

Step by Step Solution

1. Step 1: Write the proportion equation
   100.72 : 138.94 = 69.59 : x
2. Step 2: Convert to fraction form
   100.72/138.94 = 69.59/x
3. Step 3: Cross multiply
   100.72x = 138.94 × 69.59
4. Step 4: Simplify right side
   100.72x = 9,667.97
5. Step 5: Solve for x
   x = 9,667.97/100.72
6. Step 6: Final answer
   x = 95.99