Finding the Fourth Proportional to 1,045.80, 1,443.18 and 580.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,045.80 : 1,443.18 = 580.05 : x
2. Step 2: Convert to fraction form
   1,045.80/1,443.18 = 580.05/x
3. Step 3: Cross multiply
   1,045.80x = 1,443.18 × 580.05
4. Step 4: Simplify right side
   1,045.80x = 837,116.56
5. Step 5: Solve for x
   x = 837,116.56/1,045.80
6. Step 6: Final answer
   x = 800.46