Finding the Fourth Proportional to 1,017.88, 1,404.74 and 619.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.88 : 1,404.74 = 619.81 : x
2. Step 2: Convert to fraction form
   1,017.88/1,404.74 = 619.81/x
3. Step 3: Cross multiply
   1,017.88x = 1,404.74 × 619.81
4. Step 4: Simplify right side
   1,017.88x = 870,671.90
5. Step 5: Solve for x
   x = 870,671.90/1,017.88
6. Step 6: Final answer
   x = 855.38