Finding the Fourth Proportional to 2,538.78, 3,809.79 and 980.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,538.78 : 3,809.79 = 980.04 : x
2. Step 2: Convert to fraction form
   2,538.78/3,809.79 = 980.04/x
3. Step 3: Cross multiply
   2,538.78x = 3,809.79 × 980.04
4. Step 4: Simplify right side
   2,538.78x = 3,733,746.59
5. Step 5: Solve for x
   x = 3,733,746.59/2,538.78
6. Step 6: Final answer
   x = 1,470.69