Finding the Fourth Proportional to 1,290.14, 1,780.43 and 730.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.14 : 1,780.43 = 730.59 : x
2. Step 2: Convert to fraction form
   1,290.14/1,780.43 = 730.59/x
3. Step 3: Cross multiply
   1,290.14x = 1,780.43 × 730.59
4. Step 4: Simplify right side
   1,290.14x = 1,300,771.49
5. Step 5: Solve for x
   x = 1,300,771.49/1,290.14
6. Step 6: Final answer
   x = 1,008.24