Finding the Fourth Proportional to 1,247.88, 1,870.17 and 516.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,247.88 : 1,870.17 = 516.45 : x
2. Step 2: Convert to fraction form
   1,247.88/1,870.17 = 516.45/x
3. Step 3: Cross multiply
   1,247.88x = 1,870.17 × 516.45
4. Step 4: Simplify right side
   1,247.88x = 965,849.30
5. Step 5: Solve for x
   x = 965,849.30/1,247.88
6. Step 6: Final answer
   x = 773.99