Finding the Fourth Proportional to 1,061.73, 1,591.79 and 513.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.73 : 1,591.79 = 513.36 : x
2. Step 2: Convert to fraction form
   1,061.73/1,591.79 = 513.36/x
3. Step 3: Cross multiply
   1,061.73x = 1,591.79 × 513.36
4. Step 4: Simplify right side
   1,061.73x = 817,158.75
5. Step 5: Solve for x
   x = 817,158.75/1,061.73
6. Step 6: Final answer
   x = 769.65