Finding the Fourth Proportional to 5,272.89, 7,912.15 and 3,423.57

Step by Step Solution

1. Step 1: Write the proportion equation
   5,272.89 : 7,912.15 = 3,423.57 : x
2. Step 2: Convert to fraction form
   5,272.89/7,912.15 = 3,423.57/x
3. Step 3: Cross multiply
   5,272.89x = 7,912.15 × 3,423.57
4. Step 4: Simplify right side
   5,272.89x = 27,087,799.38
5. Step 5: Solve for x
   x = 27,087,799.38/5,272.89
6. Step 6: Final answer
   x = 5,137.18