Finding the Fourth Proportional to 1,985.49, 2,978.39 and 669.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.49 : 2,978.39 = 669.25 : x
2. Step 2: Convert to fraction form
   1,985.49/2,978.39 = 669.25/x
3. Step 3: Cross multiply
   1,985.49x = 2,978.39 × 669.25
4. Step 4: Simplify right side
   1,985.49x = 1,993,269.27
5. Step 5: Solve for x
   x = 1,993,269.27/1,985.49
6. Step 6: Final answer
   x = 1,003.92