Finding the Fourth Proportional to 1,636.91, 2,259.34 and 1,039.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.91 : 2,259.34 = 1,039.23 : x
2. Step 2: Convert to fraction form
   1,636.91/2,259.34 = 1,039.23/x
3. Step 3: Cross multiply
   1,636.91x = 2,259.34 × 1,039.23
4. Step 4: Simplify right side
   1,636.91x = 2,347,971.31
5. Step 5: Solve for x
   x = 2,347,971.31/1,636.91
6. Step 6: Final answer
   x = 1,434.39