Finding the Fourth Proportional to 1,076.48, 1,605.52 and 978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.48 : 1,605.52 = 978.56 : x
2. Step 2: Convert to fraction form
   1,076.48/1,605.52 = 978.56/x
3. Step 3: Cross multiply
   1,076.48x = 1,605.52 × 978.56
4. Step 4: Simplify right side
   1,076.48x = 1,571,097.65
5. Step 5: Solve for x
   x = 1,571,097.65/1,076.48
6. Step 6: Final answer
   x = 1,459.48