Finding the Fourth Proportional to 1,325.90, 1,984.16 and 978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,325.90 : 1,984.16 = 978.42 : x
2. Step 2: Convert to fraction form
   1,325.90/1,984.16 = 978.42/x
3. Step 3: Cross multiply
   1,325.90x = 1,984.16 × 978.42
4. Step 4: Simplify right side
   1,325.90x = 1,941,341.83
5. Step 5: Solve for x
   x = 1,941,341.83/1,325.90
6. Step 6: Final answer
   x = 1,464.17