Finding the Fourth Proportional to 1,061.67, 1,591.07 and 512.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.67 : 1,591.07 = 512.76 : x
2. Step 2: Convert to fraction form
   1,061.67/1,591.07 = 512.76/x
3. Step 3: Cross multiply
   1,061.67x = 1,591.07 × 512.76
4. Step 4: Simplify right side
   1,061.67x = 815,834.49
5. Step 5: Solve for x
   x = 815,834.49/1,061.67
6. Step 6: Final answer
   x = 768.44