Finding the Fourth Proportional to 2,478.78, 3,719.94 and 978.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.78 : 3,719.94 = 978.03 : x
2. Step 2: Convert to fraction form
   2,478.78/3,719.94 = 978.03/x
3. Step 3: Cross multiply
   2,478.78x = 3,719.94 × 978.03
4. Step 4: Simplify right side
   2,478.78x = 3,638,212.92
5. Step 5: Solve for x
   x = 3,638,212.92/2,478.78
6. Step 6: Final answer
   x = 1,467.74