Finding the Fourth Proportional to 1,855.78, 2,561.22 and 1,069.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,855.78 : 2,561.22 = 1,069.88 : x
2. Step 2: Convert to fraction form
   1,855.78/2,561.22 = 1,069.88/x
3. Step 3: Cross multiply
   1,855.78x = 2,561.22 × 1,069.88
4. Step 4: Simplify right side
   1,855.78x = 2,740,185.25
5. Step 5: Solve for x
   x = 2,740,185.25/1,855.78
6. Step 6: Final answer
   x = 1,476.57