Finding the Fourth Proportional to 1,448.83, 1,999.15 and 819.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,448.83 : 1,999.15 = 819.21 : x
2. Step 2: Convert to fraction form
   1,448.83/1,999.15 = 819.21/x
3. Step 3: Cross multiply
   1,448.83x = 1,999.15 × 819.21
4. Step 4: Simplify right side
   1,448.83x = 1,637,721.62
5. Step 5: Solve for x
   x = 1,637,721.62/1,448.83
6. Step 6: Final answer
   x = 1,130.38