Finding the Fourth Proportional to 2,621.85, 3,933.45 and 978.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.85 : 3,933.45 = 978.41 : x
2. Step 2: Convert to fraction form
   2,621.85/3,933.45 = 978.41/x
3. Step 3: Cross multiply
   2,621.85x = 3,933.45 × 978.41
4. Step 4: Simplify right side
   2,621.85x = 3,848,519.43
5. Step 5: Solve for x
   x = 3,848,519.43/2,621.85
6. Step 6: Final answer
   x = 1,467.87