Finding the Fourth Proportional to 1,310.73, 1,805.76 and 978.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,310.73 : 1,805.76 = 978.54 : x
2. Step 2: Convert to fraction form
   1,310.73/1,805.76 = 978.54/x
3. Step 3: Cross multiply
   1,310.73x = 1,805.76 × 978.54
4. Step 4: Simplify right side
   1,310.73x = 1,767,008.39
5. Step 5: Solve for x
   x = 1,767,008.39/1,310.73
6. Step 6: Final answer
   x = 1,348.11