Finding the Fourth Proportional to 1,815.41, 2,505.31 and 1,029.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.41 : 2,505.31 = 1,029.57 : x
2. Step 2: Convert to fraction form
   1,815.41/2,505.31 = 1,029.57/x
3. Step 3: Cross multiply
   1,815.41x = 2,505.31 × 1,029.57
4. Step 4: Simplify right side
   1,815.41x = 2,579,392.02
5. Step 5: Solve for x
   x = 2,579,392.02/1,815.41
6. Step 6: Final answer
   x = 1,420.83