Finding the Fourth Proportional to 2,149.57, 3,224.07 and 978.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,149.57 : 3,224.07 = 978.31 : x
2. Step 2: Convert to fraction form
   2,149.57/3,224.07 = 978.31/x
3. Step 3: Cross multiply
   2,149.57x = 3,224.07 × 978.31
4. Step 4: Simplify right side
   2,149.57x = 3,154,143.95
5. Step 5: Solve for x
   x = 3,154,143.95/2,149.57
6. Step 6: Final answer
   x = 1,467.34