Finding the Fourth Proportional to 2,621.82, 3,933.21 and 978.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.82 : 3,933.21 = 978.48 : x
2. Step 2: Convert to fraction form
   2,621.82/3,933.21 = 978.48/x
3. Step 3: Cross multiply
   2,621.82x = 3,933.21 × 978.48
4. Step 4: Simplify right side
   2,621.82x = 3,848,565.49
5. Step 5: Solve for x
   x = 3,848,565.49/2,621.82
6. Step 6: Final answer
   x = 1,467.90