Finding the Fourth Proportional to 3,907.89, 5,861.89 and 1,275.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,907.89 : 5,861.89 = 1,275.38 : x
2. Step 2: Convert to fraction form
   3,907.89/5,861.89 = 1,275.38/x
3. Step 3: Cross multiply
   3,907.89x = 5,861.89 × 1,275.38
4. Step 4: Simplify right side
   3,907.89x = 7,476,137.27
5. Step 5: Solve for x
   x = 7,476,137.27/3,907.89
6. Step 6: Final answer
   x = 1,913.09