Finding the Fourth Proportional to 2,072.58, 3,108.86 and 512.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.58 : 3,108.86 = 512.61 : x
2. Step 2: Convert to fraction form
   2,072.58/3,108.86 = 512.61/x
3. Step 3: Cross multiply
   2,072.58x = 3,108.86 × 512.61
4. Step 4: Simplify right side
   2,072.58x = 1,593,623.31
5. Step 5: Solve for x
   x = 1,593,623.31/2,072.58
6. Step 6: Final answer
   x = 768.91