Finding the Fourth Proportional to 1,065.40, 1,595.78 and 516.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.40 : 1,595.78 = 516.42 : x
2. Step 2: Convert to fraction form
   1,065.40/1,595.78 = 516.42/x
3. Step 3: Cross multiply
   1,065.40x = 1,595.78 × 516.42
4. Step 4: Simplify right side
   1,065.40x = 824,092.71
5. Step 5: Solve for x
   x = 824,092.71/1,065.40
6. Step 6: Final answer
   x = 773.51