Finding the Fourth Proportional to 1,608.70, 2,219.85 and 910.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.70 : 2,219.85 = 910.06 : x
2. Step 2: Convert to fraction form
   1,608.70/2,219.85 = 910.06/x
3. Step 3: Cross multiply
   1,608.70x = 2,219.85 × 910.06
4. Step 4: Simplify right side
   1,608.70x = 2,020,196.69
5. Step 5: Solve for x
   x = 2,020,196.69/1,608.70
6. Step 6: Final answer
   x = 1,255.79