Finding the Fourth Proportional to 1,608.58, 2,219.73 and 900.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.58 : 2,219.73 = 900.39 : x
2. Step 2: Convert to fraction form
   1,608.58/2,219.73 = 900.39/x
3. Step 3: Cross multiply
   1,608.58x = 2,219.73 × 900.39
4. Step 4: Simplify right side
   1,608.58x = 1,998,622.69
5. Step 5: Solve for x
   x = 1,998,622.69/1,608.58
6. Step 6: Final answer
   x = 1,242.48