Finding the Fourth Proportional to 2,605.56, 3,907.36 and 850.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.56 : 3,907.36 = 850.15 : x
2. Step 2: Convert to fraction form
   2,605.56/3,907.36 = 850.15/x
3. Step 3: Cross multiply
   2,605.56x = 3,907.36 × 850.15
4. Step 4: Simplify right side
   2,605.56x = 3,321,848.05
5. Step 5: Solve for x
   x = 3,321,848.05/2,605.56
6. Step 6: Final answer
   x = 1,274.91