Finding the Fourth Proportional to 1,815.50, 2,505.31 and 1,069.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.50 : 2,505.31 = 1,069.49 : x
2. Step 2: Convert to fraction form
   1,815.50/2,505.31 = 1,069.49/x
3. Step 3: Cross multiply
   1,815.50x = 2,505.31 × 1,069.49
4. Step 4: Simplify right side
   1,815.50x = 2,679,393.49
5. Step 5: Solve for x
   x = 2,679,393.49/1,815.50
6. Step 6: Final answer
   x = 1,475.85