Finding the Fourth Proportional to 72.42, 107.90 and 69.54

Step by Step Solution

1. Step 1: Write the proportion equation
   72.42 : 107.90 = 69.54 : x
2. Step 2: Convert to fraction form
   72.42/107.90 = 69.54/x
3. Step 3: Cross multiply
   72.42x = 107.90 × 69.54
4. Step 4: Simplify right side
   72.42x = 7,503.02
5. Step 5: Solve for x
   x = 7,503.02/72.42
6. Step 6: Final answer
   x = 103.60