Finding the Fourth Proportional to 1,323.43, 1,981.25 and 978.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,323.43 : 1,981.25 = 978.30 : x
2. Step 2: Convert to fraction form
   1,323.43/1,981.25 = 978.30/x
3. Step 3: Cross multiply
   1,323.43x = 1,981.25 × 978.30
4. Step 4: Simplify right side
   1,323.43x = 1,938,251.98
5. Step 5: Solve for x
   x = 1,938,251.98/1,323.43
6. Step 6: Final answer
   x = 1,464.57