Finding the Fourth Proportional to 1,017.93, 1,404.87 and 619.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.93 : 1,404.87 = 619.67 : x
2. Step 2: Convert to fraction form
   1,017.93/1,404.87 = 619.67/x
3. Step 3: Cross multiply
   1,017.93x = 1,404.87 × 619.67
4. Step 4: Simplify right side
   1,017.93x = 870,548.77
5. Step 5: Solve for x
   x = 870,548.77/1,017.93
6. Step 6: Final answer
   x = 855.21