Finding the Fourth Proportional to 1,017.99, 1,404.60 and 619.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.99 : 1,404.60 = 619.56 : x
2. Step 2: Convert to fraction form
   1,017.99/1,404.60 = 619.56/x
3. Step 3: Cross multiply
   1,017.99x = 1,404.60 × 619.56
4. Step 4: Simplify right side
   1,017.99x = 870,233.98
5. Step 5: Solve for x
   x = 870,233.98/1,017.99
6. Step 6: Final answer
   x = 854.86