Finding the Fourth Proportional to 2,621.66, 3,933.17 and 978.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.66 : 3,933.17 = 978.22 : x
2. Step 2: Convert to fraction form
   2,621.66/3,933.17 = 978.22/x
3. Step 3: Cross multiply
   2,621.66x = 3,933.17 × 978.22
4. Step 4: Simplify right side
   2,621.66x = 3,847,501.25
5. Step 5: Solve for x
   x = 3,847,501.25/2,621.66
6. Step 6: Final answer
   x = 1,467.58