Finding the Fourth Proportional to 1,677.82, 2,314.65 and 978.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.82 : 2,314.65 = 978.79 : x
2. Step 2: Convert to fraction form
   1,677.82/2,314.65 = 978.79/x
3. Step 3: Cross multiply
   1,677.82x = 2,314.65 × 978.79
4. Step 4: Simplify right side
   1,677.82x = 2,265,556.27
5. Step 5: Solve for x
   x = 2,265,556.27/1,677.82
6. Step 6: Final answer
   x = 1,350.30