Finding the Fourth Proportional to 1,180.17, 1,626.72 and 1,039.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,180.17 : 1,626.72 = 1,039.38 : x
2. Step 2: Convert to fraction form
   1,180.17/1,626.72 = 1,039.38/x
3. Step 3: Cross multiply
   1,180.17x = 1,626.72 × 1,039.38
4. Step 4: Simplify right side
   1,180.17x = 1,690,780.23
5. Step 5: Solve for x
   x = 1,690,780.23/1,180.17
6. Step 6: Final answer
   x = 1,432.66