Finding the Fourth Proportional to 1,327.63, 1,989.56 and 978.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,327.63 : 1,989.56 = 978.22 : x
2. Step 2: Convert to fraction form
   1,327.63/1,989.56 = 978.22/x
3. Step 3: Cross multiply
   1,327.63x = 1,989.56 × 978.22
4. Step 4: Simplify right side
   1,327.63x = 1,946,226.72
5. Step 5: Solve for x
   x = 1,946,226.72/1,327.63
6. Step 6: Final answer
   x = 1,465.94