Finding the Fourth Proportional to 2,148.30, 3,222.87 and 978.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.30 : 3,222.87 = 978.24 : x
2. Step 2: Convert to fraction form
   2,148.30/3,222.87 = 978.24/x
3. Step 3: Cross multiply
   2,148.30x = 3,222.87 × 978.24
4. Step 4: Simplify right side
   2,148.30x = 3,152,740.35
5. Step 5: Solve for x
   x = 3,152,740.35/2,148.30
6. Step 6: Final answer
   x = 1,467.55