Finding the Fourth Proportional to 1,017.72, 1,404.67 and 619.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.72 : 1,404.67 = 619.51 : x
2. Step 2: Convert to fraction form
   1,017.72/1,404.67 = 619.51/x
3. Step 3: Cross multiply
   1,017.72x = 1,404.67 × 619.51
4. Step 4: Simplify right side
   1,017.72x = 870,207.01
5. Step 5: Solve for x
   x = 870,207.01/1,017.72
6. Step 6: Final answer
   x = 855.06