Finding the Fourth Proportional to 1,984.77, 2,978.68 and 831.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,984.77 : 2,978.68 = 831.33 : x
2. Step 2: Convert to fraction form
   1,984.77/2,978.68 = 831.33/x
3. Step 3: Cross multiply
   1,984.77x = 2,978.68 × 831.33
4. Step 4: Simplify right side
   1,984.77x = 2,476,261.89
5. Step 5: Solve for x
   x = 2,476,261.89/1,984.77
6. Step 6: Final answer
   x = 1,247.63