Finding the Fourth Proportional to 2,293.72, 3,165.34 and 1,245.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,293.72 : 3,165.34 = 1,245.78 : x
2. Step 2: Convert to fraction form
   2,293.72/3,165.34 = 1,245.78/x
3. Step 3: Cross multiply
   2,293.72x = 3,165.34 × 1,245.78
4. Step 4: Simplify right side
   2,293.72x = 3,943,317.27
5. Step 5: Solve for x
   x = 3,943,317.27/2,293.72
6. Step 6: Final answer
   x = 1,719.18