Finding the Fourth Proportional to 2,539.02, 3,806.40 and 978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,539.02 : 3,806.40 = 978.18 : x
2. Step 2: Convert to fraction form
   2,539.02/3,806.40 = 978.18/x
3. Step 3: Cross multiply
   2,539.02x = 3,806.40 × 978.18
4. Step 4: Simplify right side
   2,539.02x = 3,723,344.35
5. Step 5: Solve for x
   x = 3,723,344.35/2,539.02
6. Step 6: Final answer
   x = 1,466.45