Finding the Fourth Proportional to 2,926.12, 4,389.78 and 978.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,926.12 : 4,389.78 = 978.34 : x
2. Step 2: Convert to fraction form
   2,926.12/4,389.78 = 978.34/x
3. Step 3: Cross multiply
   2,926.12x = 4,389.78 × 978.34
4. Step 4: Simplify right side
   2,926.12x = 4,294,697.37
5. Step 5: Solve for x
   x = 4,294,697.37/2,926.12
6. Step 6: Final answer
   x = 1,467.71