Finding the Fourth Proportional to 100.59, 138.72 and 69.48

Step by Step Solution

1. Step 1: Write the proportion equation
   100.59 : 138.72 = 69.48 : x
2. Step 2: Convert to fraction form
   100.59/138.72 = 69.48/x
3. Step 3: Cross multiply
   100.59x = 138.72 × 69.48
4. Step 4: Simplify right side
   100.59x = 9,638.27
5. Step 5: Solve for x
   x = 9,638.27/100.59
6. Step 6: Final answer
   x = 95.82