Finding the Fourth Proportional to 2,539.17, 3,807.74 and 978.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,539.17 : 3,807.74 = 978.30 : x
2. Step 2: Convert to fraction form
   2,539.17/3,807.74 = 978.30/x
3. Step 3: Cross multiply
   2,539.17x = 3,807.74 × 978.30
4. Step 4: Simplify right side
   2,539.17x = 3,725,112.04
5. Step 5: Solve for x
   x = 3,725,112.04/2,539.17
6. Step 6: Final answer
   x = 1,467.06