Finding the Fourth Proportional to 1,663.84, 2,496.38 and 831.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.84 : 2,496.38 = 831.27 : x
2. Step 2: Convert to fraction form
   1,663.84/2,496.38 = 831.27/x
3. Step 3: Cross multiply
   1,663.84x = 2,496.38 × 831.27
4. Step 4: Simplify right side
   1,663.84x = 2,075,165.80
5. Step 5: Solve for x
   x = 2,075,165.80/1,663.84
6. Step 6: Final answer
   x = 1,247.21