Finding the Fourth Proportional to 1,289.43, 1,779.39 and 729.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,289.43 : 1,779.39 = 729.89 : x
2. Step 2: Convert to fraction form
   1,289.43/1,779.39 = 729.89/x
3. Step 3: Cross multiply
   1,289.43x = 1,779.39 × 729.89
4. Step 4: Simplify right side
   1,289.43x = 1,298,768.80
5. Step 5: Solve for x
   x = 1,298,768.80/1,289.43
6. Step 6: Final answer
   x = 1,007.24