Finding the Fourth Proportional to 2,560.96, 3,837.72 and 1,389.97

Step by Step Solution

1. Step 1: Write the proportion equation
   2,560.96 : 3,837.72 = 1,389.97 : x
2. Step 2: Convert to fraction form
   2,560.96/3,837.72 = 1,389.97/x
3. Step 3: Cross multiply
   2,560.96x = 3,837.72 × 1,389.97
4. Step 4: Simplify right side
   2,560.96x = 5,334,315.67
5. Step 5: Solve for x
   x = 5,334,315.67/2,560.96
6. Step 6: Final answer
   x = 2,082.94