Finding the Fourth Proportional to 1,636.62, 2,448.87 and 978.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.62 : 2,448.87 = 978.86 : x
2. Step 2: Convert to fraction form
   1,636.62/2,448.87 = 978.86/x
3. Step 3: Cross multiply
   1,636.62x = 2,448.87 × 978.86
4. Step 4: Simplify right side
   1,636.62x = 2,397,100.89
5. Step 5: Solve for x
   x = 2,397,100.89/1,636.62
6. Step 6: Final answer
   x = 1,464.67