Finding the Fourth Proportional to 1,608.21, 2,219.27 and 900

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.21 : 2,219.27 = 900 : x
2. Step 2: Convert to fraction form
   1,608.21/2,219.27 = 900/x
3. Step 3: Cross multiply
   1,608.21x = 2,219.27 × 900
4. Step 4: Simplify right side
   1,608.21x = 1,997,338.50
5. Step 5: Solve for x
   x = 1,997,338.50/1,608.21
6. Step 6: Final answer
   x = 1,241.96