Finding the Fourth Proportional to 1,667.01, 2,497.16 and 831.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.01 : 2,497.16 = 831.55 : x
2. Step 2: Convert to fraction form
   1,667.01/2,497.16 = 831.55/x
3. Step 3: Cross multiply
   1,667.01x = 2,497.16 × 831.55
4. Step 4: Simplify right side
   1,667.01x = 2,076,513.40
5. Step 5: Solve for x
   x = 2,076,513.40/1,667.01
6. Step 6: Final answer
   x = 1,245.65