Finding the Fourth Proportional to 1,818.72, 2,508.79 and 1,072.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,818.72 : 2,508.79 = 1,072.57 : x
2. Step 2: Convert to fraction form
   1,818.72/2,508.79 = 1,072.57/x
3. Step 3: Cross multiply
   1,818.72x = 2,508.79 × 1,072.57
4. Step 4: Simplify right side
   1,818.72x = 2,690,852.89
5. Step 5: Solve for x
   x = 2,690,852.89/1,818.72
6. Step 6: Final answer
   x = 1,479.53