Finding the Fourth Proportional to 1,608.51, 2,219.71 and 909.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.51 : 2,219.71 = 909.87 : x
2. Step 2: Convert to fraction form
   1,608.51/2,219.71 = 909.87/x
3. Step 3: Cross multiply
   1,608.51x = 2,219.71 × 909.87
4. Step 4: Simplify right side
   1,608.51x = 2,019,647.54
5. Step 5: Solve for x
   x = 2,019,647.54/1,608.51
6. Step 6: Final answer
   x = 1,255.60