Finding the Fourth Proportional to 2,148.53, 3,220.05 and 978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.53 : 3,220.05 = 978.18 : x
2. Step 2: Convert to fraction form
   2,148.53/3,220.05 = 978.18/x
3. Step 3: Cross multiply
   2,148.53x = 3,220.05 × 978.18
4. Step 4: Simplify right side
   2,148.53x = 3,149,780.10
5. Step 5: Solve for x
   x = 3,149,780.10/2,148.53
6. Step 6: Final answer
   x = 1,466.02