Finding the Fourth Proportional to 1,677.78, 2,314.98 and 978.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.78 : 2,314.98 = 978.84 : x
2. Step 2: Convert to fraction form
   1,677.78/2,314.98 = 978.84/x
3. Step 3: Cross multiply
   1,677.78x = 2,314.98 × 978.84
4. Step 4: Simplify right side
   1,677.78x = 2,265,995.02
5. Step 5: Solve for x
   x = 2,265,995.02/1,677.78
6. Step 6: Final answer
   x = 1,350.59