Finding the Fourth Proportional to 2,056.38, 3,083.78 and 669.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,056.38 : 3,083.78 = 669.36 : x
2. Step 2: Convert to fraction form
   2,056.38/3,083.78 = 669.36/x
3. Step 3: Cross multiply
   2,056.38x = 3,083.78 × 669.36
4. Step 4: Simplify right side
   2,056.38x = 2,064,158.98
5. Step 5: Solve for x
   x = 2,064,158.98/2,056.38
6. Step 6: Final answer
   x = 1,003.78