Finding the Fourth Proportional to 2,145.30, 3,213.81 and 1,819.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.30 : 3,213.81 = 1,819.86 : x
2. Step 2: Convert to fraction form
   2,145.30/3,213.81 = 1,819.86/x
3. Step 3: Cross multiply
   2,145.30x = 3,213.81 × 1,819.86
4. Step 4: Simplify right side
   2,145.30x = 5,848,684.27
5. Step 5: Solve for x
   x = 5,848,684.27/2,145.30
6. Step 6: Final answer
   x = 2,726.28