Finding the Fourth Proportional to 5,272.68, 7,912.71 and 3,889.61

Step by Step Solution

1. Step 1: Write the proportion equation
   5,272.68 : 7,912.71 = 3,889.61 : x
2. Step 2: Convert to fraction form
   5,272.68/7,912.71 = 3,889.61/x
3. Step 3: Cross multiply
   5,272.68x = 7,912.71 × 3,889.61
4. Step 4: Simplify right side
   5,272.68x = 30,777,316.38
5. Step 5: Solve for x
   x = 30,777,316.38/5,272.68
6. Step 6: Final answer
   x = 5,837.13