Finding the Fourth Proportional to 1,608.07, 2,219.18 and 899.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.07 : 2,219.18 = 899.89 : x
2. Step 2: Convert to fraction form
   1,608.07/2,219.18 = 899.89/x
3. Step 3: Cross multiply
   1,608.07x = 2,219.18 × 899.89
4. Step 4: Simplify right side
   1,608.07x = 1,997,013.39
5. Step 5: Solve for x
   x = 1,997,013.39/1,608.07
6. Step 6: Final answer
   x = 1,241.87