Finding the Fourth Proportional to 1,071.72, 1,608.03 and 516.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.72 : 1,608.03 = 516.17 : x
2. Step 2: Convert to fraction form
   1,071.72/1,608.03 = 516.17/x
3. Step 3: Cross multiply
   1,071.72x = 1,608.03 × 516.17
4. Step 4: Simplify right side
   1,071.72x = 830,020.87
5. Step 5: Solve for x
   x = 830,020.87/1,071.72
6. Step 6: Final answer
   x = 774.48