Finding the Fourth Proportional to 1,383.16, 2,064.56 and 1,219.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.16 : 2,064.56 = 1,219.12 : x
2. Step 2: Convert to fraction form
   1,383.16/2,064.56 = 1,219.12/x
3. Step 3: Cross multiply
   1,383.16x = 2,064.56 × 1,219.12
4. Step 4: Simplify right side
   1,383.16x = 2,516,946.39
5. Step 5: Solve for x
   x = 2,516,946.39/1,383.16
6. Step 6: Final answer
   x = 1,819.71