Finding the Fourth Proportional to 1,664.30, 2,497.89 and 690.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,664.30 : 2,497.89 = 690.38 : x
2. Step 2: Convert to fraction form
   1,664.30/2,497.89 = 690.38/x
3. Step 3: Cross multiply
   1,664.30x = 2,497.89 × 690.38
4. Step 4: Simplify right side
   1,664.30x = 1,724,493.30
5. Step 5: Solve for x
   x = 1,724,493.30/1,664.30
6. Step 6: Final answer
   x = 1,036.17