Finding the Fourth Proportional to 2,926.20, 4,389.54 and 978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,926.20 : 4,389.54 = 978.42 : x
2. Step 2: Convert to fraction form
   2,926.20/4,389.54 = 978.42/x
3. Step 3: Cross multiply
   2,926.20x = 4,389.54 × 978.42
4. Step 4: Simplify right side
   2,926.20x = 4,294,813.73
5. Step 5: Solve for x
   x = 4,294,813.73/2,926.20
6. Step 6: Final answer
   x = 1,467.71