Finding the Fourth Proportional to 3,886.38, 5,830.48 and 1,289.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.38 : 5,830.48 = 1,289.31 : x
2. Step 2: Convert to fraction form
   3,886.38/5,830.48 = 1,289.31/x
3. Step 3: Cross multiply
   3,886.38x = 5,830.48 × 1,289.31
4. Step 4: Simplify right side
   3,886.38x = 7,517,296.17
5. Step 5: Solve for x
   x = 7,517,296.17/3,886.38
6. Step 6: Final answer
   x = 1,934.27