Finding the Fourth Proportional to 2,638.80, 3,959.76 and 974.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.80 : 3,959.76 = 974.10 : x
2. Step 2: Convert to fraction form
   2,638.80/3,959.76 = 974.10/x
3. Step 3: Cross multiply
   2,638.80x = 3,959.76 × 974.10
4. Step 4: Simplify right side
   2,638.80x = 3,857,202.22
5. Step 5: Solve for x
   x = 3,857,202.22/2,638.80
6. Step 6: Final answer
   x = 1,461.73