Finding the Fourth Proportional to 2,148.10, 3,222.45 and 978.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.10 : 3,222.45 = 978.10 : x
2. Step 2: Convert to fraction form
   2,148.10/3,222.45 = 978.10/x
3. Step 3: Cross multiply
   2,148.10x = 3,222.45 × 978.10
4. Step 4: Simplify right side
   2,148.10x = 3,151,870.29
5. Step 5: Solve for x
   x = 3,151,870.29/2,148.10
6. Step 6: Final answer
   x = 1,467.28