Finding the Fourth Proportional to 2,145.57, 3,216.14 and 1,219.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.57 : 3,216.14 = 1,219.13 : x
2. Step 2: Convert to fraction form
   2,145.57/3,216.14 = 1,219.13/x
3. Step 3: Cross multiply
   2,145.57x = 3,216.14 × 1,219.13
4. Step 4: Simplify right side
   2,145.57x = 3,920,905.30
5. Step 5: Solve for x
   x = 3,920,905.30/2,145.57
6. Step 6: Final answer
   x = 1,827.44