Finding the Fourth Proportional to 1,242.72, 1,865.12 and 512.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.72 : 1,865.12 = 512.82 : x
2. Step 2: Convert to fraction form
   1,242.72/1,865.12 = 512.82/x
3. Step 3: Cross multiply
   1,242.72x = 1,865.12 × 512.82
4. Step 4: Simplify right side
   1,242.72x = 956,468.27
5. Step 5: Solve for x
   x = 956,468.27/1,242.72
6. Step 6: Final answer
   x = 769.66