Finding the Fourth Proportional to 1,013.49, 1,398.06 and 619.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.49 : 1,398.06 = 619.83 : x
2. Step 2: Convert to fraction form
   1,013.49/1,398.06 = 619.83/x
3. Step 3: Cross multiply
   1,013.49x = 1,398.06 × 619.83
4. Step 4: Simplify right side
   1,013.49x = 866,559.53
5. Step 5: Solve for x
   x = 866,559.53/1,013.49
6. Step 6: Final answer
   x = 855.03