Finding the Fourth Proportional to 1,677.26, 2,314.89 and 978.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.26 : 2,314.89 = 978.63 : x
2. Step 2: Convert to fraction form
   1,677.26/2,314.89 = 978.63/x
3. Step 3: Cross multiply
   1,677.26x = 2,314.89 × 978.63
4. Step 4: Simplify right side
   1,677.26x = 2,265,420.80
5. Step 5: Solve for x
   x = 2,265,420.80/1,677.26
6. Step 6: Final answer
   x = 1,350.67