Finding the Fourth Proportional to 1,127.98, 1,690.62 and 580.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.98 : 1,690.62 = 580.42 : x
2. Step 2: Convert to fraction form
   1,127.98/1,690.62 = 580.42/x
3. Step 3: Cross multiply
   1,127.98x = 1,690.62 × 580.42
4. Step 4: Simplify right side
   1,127.98x = 981,269.66
5. Step 5: Solve for x
   x = 981,269.66/1,127.98
6. Step 6: Final answer
   x = 869.94