Finding the Fourth Proportional to 1,304.52, 1,800.24 and 780.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.52 : 1,800.24 = 780.56 : x
2. Step 2: Convert to fraction form
   1,304.52/1,800.24 = 780.56/x
3. Step 3: Cross multiply
   1,304.52x = 1,800.24 × 780.56
4. Step 4: Simplify right side
   1,304.52x = 1,405,195.33
5. Step 5: Solve for x
   x = 1,405,195.33/1,304.52
6. Step 6: Final answer
   x = 1,077.17