Finding the Fourth Proportional to 1,664.69, 2,496.52 and 690.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,664.69 : 2,496.52 = 690.57 : x
2. Step 2: Convert to fraction form
   1,664.69/2,496.52 = 690.57/x
3. Step 3: Cross multiply
   1,664.69x = 2,496.52 × 690.57
4. Step 4: Simplify right side
   1,664.69x = 1,724,021.82
5. Step 5: Solve for x
   x = 1,724,021.82/1,664.69
6. Step 6: Final answer
   x = 1,035.64