Finding the Fourth Proportional to 1,429.78, 2,142.90 and 844.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.78 : 2,142.90 = 844.19 : x
2. Step 2: Convert to fraction form
   1,429.78/2,142.90 = 844.19/x
3. Step 3: Cross multiply
   1,429.78x = 2,142.90 × 844.19
4. Step 4: Simplify right side
   1,429.78x = 1,809,014.75
5. Step 5: Solve for x
   x = 1,809,014.75/1,429.78
6. Step 6: Final answer
   x = 1,265.24