Finding the Fourth Proportional to 1,628.53, 2,439.54 and 978.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,628.53 : 2,439.54 = 978.91 : x
2. Step 2: Convert to fraction form
   1,628.53/2,439.54 = 978.91/x
3. Step 3: Cross multiply
   1,628.53x = 2,439.54 × 978.91
4. Step 4: Simplify right side
   1,628.53x = 2,388,090.10
5. Step 5: Solve for x
   x = 2,388,090.10/1,628.53
6. Step 6: Final answer
   x = 1,466.41