Finding the Fourth Proportional to 1,321.83, 1,984.37 and 619.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.83 : 1,984.37 = 619.72 : x
2. Step 2: Convert to fraction form
   1,321.83/1,984.37 = 619.72/x
3. Step 3: Cross multiply
   1,321.83x = 1,984.37 × 619.72
4. Step 4: Simplify right side
   1,321.83x = 1,229,745.72
5. Step 5: Solve for x
   x = 1,229,745.72/1,321.83
6. Step 6: Final answer
   x = 930.34