Finding the Fourth Proportional to 2,253.51, 3,109.78 and 1,245.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,253.51 : 3,109.78 = 1,245.15 : x
2. Step 2: Convert to fraction form
   2,253.51/3,109.78 = 1,245.15/x
3. Step 3: Cross multiply
   2,253.51x = 3,109.78 × 1,245.15
4. Step 4: Simplify right side
   2,253.51x = 3,872,142.57
5. Step 5: Solve for x
   x = 3,872,142.57/2,253.51
6. Step 6: Final answer
   x = 1,718.27