Finding the Fourth Proportional to 1,872.72, 2,809.56 and 718.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,872.72 : 2,809.56 = 718.56 : x
2. Step 2: Convert to fraction form
   1,872.72/2,809.56 = 718.56/x
3. Step 3: Cross multiply
   1,872.72x = 2,809.56 × 718.56
4. Step 4: Simplify right side
   1,872.72x = 2,018,837.43
5. Step 5: Solve for x
   x = 2,018,837.43/1,872.72
6. Step 6: Final answer
   x = 1,078.02