Finding the Fourth Proportional to 1,669.81, 2,500.09 and 1,085.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,669.81 : 2,500.09 = 1,085.49 : x
2. Step 2: Convert to fraction form
   1,669.81/2,500.09 = 1,085.49/x
3. Step 3: Cross multiply
   1,669.81x = 2,500.09 × 1,085.49
4. Step 4: Simplify right side
   1,669.81x = 2,713,822.69
5. Step 5: Solve for x
   x = 2,713,822.69/1,669.81
6. Step 6: Final answer
   x = 1,625.23