Finding the Fourth Proportional to 2,672.79, 4,003.71 and 1,980.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,672.79 : 4,003.71 = 1,980.24 : x
2. Step 2: Convert to fraction form
   2,672.79/4,003.71 = 1,980.24/x
3. Step 3: Cross multiply
   2,672.79x = 4,003.71 × 1,980.24
4. Step 4: Simplify right side
   2,672.79x = 7,928,306.69
5. Step 5: Solve for x
   x = 7,928,306.69/2,672.79
6. Step 6: Final answer
   x = 2,966.30