Finding the Fourth Proportional to 1,815.72, 2,505.87 and 1,069.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.72 : 2,505.87 = 1,069.92 : x
2. Step 2: Convert to fraction form
   1,815.72/2,505.87 = 1,069.92/x
3. Step 3: Cross multiply
   1,815.72x = 2,505.87 × 1,069.92
4. Step 4: Simplify right side
   1,815.72x = 2,681,080.43
5. Step 5: Solve for x
   x = 2,681,080.43/1,815.72
6. Step 6: Final answer
   x = 1,476.59