Finding the Fourth Proportional to 2,623.38, 3,936.57 and 980.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,623.38 : 3,936.57 = 980.02 : x
2. Step 2: Convert to fraction form
   2,623.38/3,936.57 = 980.02/x
3. Step 3: Cross multiply
   2,623.38x = 3,936.57 × 980.02
4. Step 4: Simplify right side
   2,623.38x = 3,857,917.33
5. Step 5: Solve for x
   x = 3,857,917.33/2,623.38
6. Step 6: Final answer
   x = 1,470.59