Finding the Fourth Proportional to 2,451.71, 3,382.61 and 1,389.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,451.71 : 3,382.61 = 1,389.30 : x
2. Step 2: Convert to fraction form
   2,451.71/3,382.61 = 1,389.30/x
3. Step 3: Cross multiply
   2,451.71x = 3,382.61 × 1,389.30
4. Step 4: Simplify right side
   2,451.71x = 4,699,453.13
5. Step 5: Solve for x
   x = 4,699,453.13/2,451.71
6. Step 6: Final answer
   x = 1,916.81