Finding the Fourth Proportional to 72.50, 107.88 and 72.38

Step by Step Solution

1. Step 1: Write the proportion equation
   72.50 : 107.88 = 72.38 : x
2. Step 2: Convert to fraction form
   72.50/107.88 = 72.38/x
3. Step 3: Cross multiply
   72.50x = 107.88 × 72.38
4. Step 4: Simplify right side
   72.50x = 7,808.35
5. Step 5: Solve for x
   x = 7,808.35/72.50
6. Step 6: Final answer
   x = 107.70