Finding the Fourth Proportional to 2,990.48, 4,118.28 and 2,980.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.48 : 4,118.28 = 2,980.76 : x
2. Step 2: Convert to fraction form
   2,990.48/4,118.28 = 2,980.76/x
3. Step 3: Cross multiply
   2,990.48x = 4,118.28 × 2,980.76
4. Step 4: Simplify right side
   2,990.48x = 12,275,604.29
5. Step 5: Solve for x
   x = 12,275,604.29/2,990.48
6. Step 6: Final answer
   x = 4,104.89