Finding the Fourth Proportional to 1,778.72, 2,662.80 and 1,318.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,778.72 : 2,662.80 = 1,318.56 : x
2. Step 2: Convert to fraction form
   1,778.72/2,662.80 = 1,318.56/x
3. Step 3: Cross multiply
   1,778.72x = 2,662.80 × 1,318.56
4. Step 4: Simplify right side
   1,778.72x = 3,511,061.57
5. Step 5: Solve for x
   x = 3,511,061.57/1,778.72
6. Step 6: Final answer
   x = 1,973.93