Finding the Fourth Proportional to 7,078.82, 10,619.72 and 2,918.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,078.82 : 10,619.72 = 2,918.80 : x
2. Step 2: Convert to fraction form
   7,078.82/10,619.72 = 2,918.80/x
3. Step 3: Cross multiply
   7,078.82x = 10,619.72 × 2,918.80
4. Step 4: Simplify right side
   7,078.82x = 30,996,819.48
5. Step 5: Solve for x
   x = 30,996,819.48/7,078.82
6. Step 6: Final answer
   x = 4,378.81