Finding the Fourth Proportional to 2,539.48, 3,807.60 and 978.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,539.48 : 3,807.60 = 978.62 : x
2. Step 2: Convert to fraction form
   2,539.48/3,807.60 = 978.62/x
3. Step 3: Cross multiply
   2,539.48x = 3,807.60 × 978.62
4. Step 4: Simplify right side
   2,539.48x = 3,726,193.51
5. Step 5: Solve for x
   x = 3,726,193.51/2,539.48
6. Step 6: Final answer
   x = 1,467.31