Finding the Fourth Proportional to 1,608.69, 2,219.94 and 910.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.69 : 2,219.94 = 910.11 : x
2. Step 2: Convert to fraction form
   1,608.69/2,219.94 = 910.11/x
3. Step 3: Cross multiply
   1,608.69x = 2,219.94 × 910.11
4. Step 4: Simplify right side
   1,608.69x = 2,020,389.59
5. Step 5: Solve for x
   x = 2,020,389.59/1,608.69
6. Step 6: Final answer
   x = 1,255.92