Finding the Fourth Proportional to 1,017.12, 1,403.69 and 619.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.12 : 1,403.69 = 619.06 : x
2. Step 2: Convert to fraction form
   1,017.12/1,403.69 = 619.06/x
3. Step 3: Cross multiply
   1,017.12x = 1,403.69 × 619.06
4. Step 4: Simplify right side
   1,017.12x = 868,968.33
5. Step 5: Solve for x
   x = 868,968.33/1,017.12
6. Step 6: Final answer
   x = 854.34