Finding the Fourth Proportional to 2,459.69, 3,688.75 and 978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.69 : 3,688.75 = 978.42 : x
2. Step 2: Convert to fraction form
   2,459.69/3,688.75 = 978.42/x
3. Step 3: Cross multiply
   2,459.69x = 3,688.75 × 978.42
4. Step 4: Simplify right side
   2,459.69x = 3,609,146.78
5. Step 5: Solve for x
   x = 3,609,146.78/2,459.69
6. Step 6: Final answer
   x = 1,467.32