Finding the Fourth Proportional to 5,287.58, 7,282.06 and 5,172.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,287.58 : 7,282.06 = 5,172.78 : x
2. Step 2: Convert to fraction form
   5,287.58/7,282.06 = 5,172.78/x
3. Step 3: Cross multiply
   5,287.58x = 7,282.06 × 5,172.78
4. Step 4: Simplify right side
   5,287.58x = 37,668,481.39
5. Step 5: Solve for x
   x = 37,668,481.39/5,287.58
6. Step 6: Final answer
   x = 7,123.96