Finding the Fourth Proportional to 1,288.91, 1,934.69 and 803.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.91 : 1,934.69 = 803.12 : x
2. Step 2: Convert to fraction form
   1,288.91/1,934.69 = 803.12/x
3. Step 3: Cross multiply
   1,288.91x = 1,934.69 × 803.12
4. Step 4: Simplify right side
   1,288.91x = 1,553,774.54
5. Step 5: Solve for x
   x = 1,553,774.54/1,288.91
6. Step 6: Final answer
   x = 1,205.49