Finding the Fourth Proportional to 93.50, 128.67 and 72.69

Step by Step Solution

1. Step 1: Write the proportion equation
   93.50 : 128.67 = 72.69 : x
2. Step 2: Convert to fraction form
   93.50/128.67 = 72.69/x
3. Step 3: Cross multiply
   93.50x = 128.67 × 72.69
4. Step 4: Simplify right side
   93.50x = 9,353.02
5. Step 5: Solve for x
   x = 9,353.02/93.50
6. Step 6: Final answer
   x = 100.04