Finding the Fourth Proportional to 1,018.19, 1,404.86 and 619.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.19 : 1,404.86 = 619.85 : x
2. Step 2: Convert to fraction form
   1,018.19/1,404.86 = 619.85/x
3. Step 3: Cross multiply
   1,018.19x = 1,404.86 × 619.85
4. Step 4: Simplify right side
   1,018.19x = 870,802.88
5. Step 5: Solve for x
   x = 870,802.88/1,018.19
6. Step 6: Final answer
   x = 855.24