Finding the Fourth Proportional to 5,086.43, 7,629.74 and 1,389.05

Step by Step Solution

1. Step 1: Write the proportion equation
   5,086.43 : 7,629.74 = 1,389.05 : x
2. Step 2: Convert to fraction form
   5,086.43/7,629.74 = 1,389.05/x
3. Step 3: Cross multiply
   5,086.43x = 7,629.74 × 1,389.05
4. Step 4: Simplify right side
   5,086.43x = 10,598,045.25
5. Step 5: Solve for x
   x = 10,598,045.25/5,086.43
6. Step 6: Final answer
   x = 2,083.59