Finding the Fourth Proportional to 1,609.90, 2,221.69 and 901.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,609.90 : 2,221.69 = 901.74 : x
2. Step 2: Convert to fraction form
   1,609.90/2,221.69 = 901.74/x
3. Step 3: Cross multiply
   1,609.90x = 2,221.69 × 901.74
4. Step 4: Simplify right side
   1,609.90x = 2,003,380.00
5. Step 5: Solve for x
   x = 2,003,380.00/1,609.90
6. Step 6: Final answer
   x = 1,244.41