Finding the Fourth Proportional to 1,382.10, 1,906.96 and 934.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.10 : 1,906.96 = 934.80 : x
2. Step 2: Convert to fraction form
   1,382.10/1,906.96 = 934.80/x
3. Step 3: Cross multiply
   1,382.10x = 1,906.96 × 934.80
4. Step 4: Simplify right side
   1,382.10x = 1,782,626.21
5. Step 5: Solve for x
   x = 1,782,626.21/1,382.10
6. Step 6: Final answer
   x = 1,289.80