Finding the Fourth Proportional to 2,980.78, 4,472.66 and 1,338.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,980.78 : 4,472.66 = 1,338.50 : x
2. Step 2: Convert to fraction form
   2,980.78/4,472.66 = 1,338.50/x
3. Step 3: Cross multiply
   2,980.78x = 4,472.66 × 1,338.50
4. Step 4: Simplify right side
   2,980.78x = 5,986,655.41
5. Step 5: Solve for x
   x = 5,986,655.41/2,980.78
6. Step 6: Final answer
   x = 2,008.42