Finding the Fourth Proportional to 1,609.69, 2,221.18 and 901.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,609.69 : 2,221.18 = 901.43 : x
2. Step 2: Convert to fraction form
   1,609.69/2,221.18 = 901.43/x
3. Step 3: Cross multiply
   1,609.69x = 2,221.18 × 901.43
4. Step 4: Simplify right side
   1,609.69x = 2,002,238.29
5. Step 5: Solve for x
   x = 2,002,238.29/1,609.69
6. Step 6: Final answer
   x = 1,243.87