Finding the Fourth Proportional to 1,608.61, 2,219.83 and 900.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.61 : 2,219.83 = 900.46 : x
2. Step 2: Convert to fraction form
   1,608.61/2,219.83 = 900.46/x
3. Step 3: Cross multiply
   1,608.61x = 2,219.83 × 900.46
4. Step 4: Simplify right side
   1,608.61x = 1,998,868.12
5. Step 5: Solve for x
   x = 1,998,868.12/1,608.61
6. Step 6: Final answer
   x = 1,242.61