Finding the Fourth Proportional to 1,189.35, 1,640.98 and 1,031.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.35 : 1,640.98 = 1,031.74 : x
2. Step 2: Convert to fraction form
   1,189.35/1,640.98 = 1,031.74/x
3. Step 3: Cross multiply
   1,189.35x = 1,640.98 × 1,031.74
4. Step 4: Simplify right side
   1,189.35x = 1,693,058.02
5. Step 5: Solve for x
   x = 1,693,058.02/1,189.35
6. Step 6: Final answer
   x = 1,423.52