Finding the Fourth Proportional to 1,677.51, 2,314.98 and 978.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.51 : 2,314.98 = 978.75 : x
2. Step 2: Convert to fraction form
   1,677.51/2,314.98 = 978.75/x
3. Step 3: Cross multiply
   1,677.51x = 2,314.98 × 978.75
4. Step 4: Simplify right side
   1,677.51x = 2,265,786.68
5. Step 5: Solve for x
   x = 2,265,786.68/1,677.51
6. Step 6: Final answer
   x = 1,350.68