Finding the Fourth Proportional to 1,399.48, 2,098.68 and 669.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.48 : 2,098.68 = 669.40 : x
2. Step 2: Convert to fraction form
   1,399.48/2,098.68 = 669.40/x
3. Step 3: Cross multiply
   1,399.48x = 2,098.68 × 669.40
4. Step 4: Simplify right side
   1,399.48x = 1,404,856.39
5. Step 5: Solve for x
   x = 1,404,856.39/1,399.48
6. Step 6: Final answer
   x = 1,003.84