Finding the Fourth Proportional to 1,116.43, 1,674.98 and 423.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.43 : 1,674.98 = 423.31 : x
2. Step 2: Convert to fraction form
   1,116.43/1,674.98 = 423.31/x
3. Step 3: Cross multiply
   1,116.43x = 1,674.98 × 423.31
4. Step 4: Simplify right side
   1,116.43x = 709,031.07
5. Step 5: Solve for x
   x = 709,031.07/1,116.43
6. Step 6: Final answer
   x = 635.09