Finding the Fourth Proportional to 1,976.88, 2,965.62 and 678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,976.88 : 2,965.62 = 678.72 : x
2. Step 2: Convert to fraction form
   1,976.88/2,965.62 = 678.72/x
3. Step 3: Cross multiply
   1,976.88x = 2,965.62 × 678.72
4. Step 4: Simplify right side
   1,976.88x = 2,012,825.61
5. Step 5: Solve for x
   x = 2,012,825.61/1,976.88
6. Step 6: Final answer
   x = 1,018.18