Finding the Fourth Proportional to 1,819.41, 2,512.20 and 1,399.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,819.41 : 2,512.20 = 1,399.10 : x
2. Step 2: Convert to fraction form
   1,819.41/2,512.20 = 1,399.10/x
3. Step 3: Cross multiply
   1,819.41x = 2,512.20 × 1,399.10
4. Step 4: Simplify right side
   1,819.41x = 3,514,806.46
5. Step 5: Solve for x
   x = 3,514,806.46/1,819.41
6. Step 6: Final answer
   x = 1,931.84