Finding the Fourth Proportional to 1,247.59, 1,870.27 and 516.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,247.59 : 1,870.27 = 516.70 : x
2. Step 2: Convert to fraction form
   1,247.59/1,870.27 = 516.70/x
3. Step 3: Cross multiply
   1,247.59x = 1,870.27 × 516.70
4. Step 4: Simplify right side
   1,247.59x = 966,368.51
5. Step 5: Solve for x
   x = 966,368.51/1,247.59
6. Step 6: Final answer
   x = 774.59