Finding the Fourth Proportional to 1,247.42, 1,870.79 and 516.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,247.42 : 1,870.79 = 516.82 : x
2. Step 2: Convert to fraction form
   1,247.42/1,870.79 = 516.82/x
3. Step 3: Cross multiply
   1,247.42x = 1,870.79 × 516.82
4. Step 4: Simplify right side
   1,247.42x = 966,861.69
5. Step 5: Solve for x
   x = 966,861.69/1,247.42
6. Step 6: Final answer
   x = 775.09