Finding the Fourth Proportional to 2,926.41, 4,388.62 and 978.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,926.41 : 4,388.62 = 978.09 : x
2. Step 2: Convert to fraction form
   2,926.41/4,388.62 = 978.09/x
3. Step 3: Cross multiply
   2,926.41x = 4,388.62 × 978.09
4. Step 4: Simplify right side
   2,926.41x = 4,292,465.34
5. Step 5: Solve for x
   x = 4,292,465.34/2,926.41
6. Step 6: Final answer
   x = 1,466.80