Finding the Fourth Proportional to 1,818.56, 2,507.10 and 1,228.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,818.56 : 2,507.10 = 1,228.16 : x
2. Step 2: Convert to fraction form
   1,818.56/2,507.10 = 1,228.16/x
3. Step 3: Cross multiply
   1,818.56x = 2,507.10 × 1,228.16
4. Step 4: Simplify right side
   1,818.56x = 3,079,119.94
5. Step 5: Solve for x
   x = 3,079,119.94/1,818.56
6. Step 6: Final answer
   x = 1,693.16