Finding the Fourth Proportional to 1,435.83, 2,150.70 and 819.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.83 : 2,150.70 = 819.21 : x
2. Step 2: Convert to fraction form
   1,435.83/2,150.70 = 819.21/x
3. Step 3: Cross multiply
   1,435.83x = 2,150.70 × 819.21
4. Step 4: Simplify right side
   1,435.83x = 1,761,884.55
5. Step 5: Solve for x
   x = 1,761,884.55/1,435.83
6. Step 6: Final answer
   x = 1,227.09