Finding the Fourth Proportional to 1,339.69, 2,008.69 and 646.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.69 : 2,008.69 = 646.53 : x
2. Step 2: Convert to fraction form
   1,339.69/2,008.69 = 646.53/x
3. Step 3: Cross multiply
   1,339.69x = 2,008.69 × 646.53
4. Step 4: Simplify right side
   1,339.69x = 1,298,676.73
5. Step 5: Solve for x
   x = 1,298,676.73/1,339.69
6. Step 6: Final answer
   x = 969.39