Finding the Fourth Proportional to 1,608.52, 2,219.72 and 909.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.52 : 2,219.72 = 909.90 : x
2. Step 2: Convert to fraction form
   1,608.52/2,219.72 = 909.90/x
3. Step 3: Cross multiply
   1,608.52x = 2,219.72 × 909.90
4. Step 4: Simplify right side
   1,608.52x = 2,019,712.13
5. Step 5: Solve for x
   x = 2,019,712.13/1,608.52
6. Step 6: Final answer
   x = 1,255.63