Finding the Fourth Proportional to 1,677.30, 2,314.53 and 978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.30 : 2,314.53 = 978.72 : x
2. Step 2: Convert to fraction form
   1,677.30/2,314.53 = 978.72/x
3. Step 3: Cross multiply
   1,677.30x = 2,314.53 × 978.72
4. Step 4: Simplify right side
   1,677.30x = 2,265,276.80
5. Step 5: Solve for x
   x = 2,265,276.80/1,677.30
6. Step 6: Final answer
   x = 1,350.55