Finding the Fourth Proportional to 1,287.32, 1,931.24 and 517.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.32 : 1,931.24 = 517.82 : x
2. Step 2: Convert to fraction form
   1,287.32/1,931.24 = 517.82/x
3. Step 3: Cross multiply
   1,287.32x = 1,931.24 × 517.82
4. Step 4: Simplify right side
   1,287.32x = 1,000,034.70
5. Step 5: Solve for x
   x = 1,000,034.70/1,287.32
6. Step 6: Final answer
   x = 776.83