Finding the Fourth Proportional to 1,677.38, 2,314.91 and 978.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.38 : 2,314.91 = 978.89 : x
2. Step 2: Convert to fraction form
   1,677.38/2,314.91 = 978.89/x
3. Step 3: Cross multiply
   1,677.38x = 2,314.91 × 978.89
4. Step 4: Simplify right side
   1,677.38x = 2,266,033.12
5. Step 5: Solve for x
   x = 2,266,033.12/1,677.38
6. Step 6: Final answer
   x = 1,350.94