Finding the Fourth Proportional to 1,609.21, 2,221.01 and 910.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,609.21 : 2,221.01 = 910.59 : x
2. Step 2: Convert to fraction form
   1,609.21/2,221.01 = 910.59/x
3. Step 3: Cross multiply
   1,609.21x = 2,221.01 × 910.59
4. Step 4: Simplify right side
   1,609.21x = 2,022,429.50
5. Step 5: Solve for x
   x = 2,022,429.50/1,609.21
6. Step 6: Final answer
   x = 1,256.78