Finding the Fourth Proportional to 2,112.78, 3,168.16 and 725.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.78 : 3,168.16 = 725.76 : x
2. Step 2: Convert to fraction form
   2,112.78/3,168.16 = 725.76/x
3. Step 3: Cross multiply
   2,112.78x = 3,168.16 × 725.76
4. Step 4: Simplify right side
   2,112.78x = 2,299,326.07
5. Step 5: Solve for x
   x = 2,299,326.07/2,112.78
6. Step 6: Final answer
   x = 1,088.29