Finding the Fourth Proportional to 2,085.30, 3,126.95 and 768.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.30 : 3,126.95 = 768.15 : x
2. Step 2: Convert to fraction form
   2,085.30/3,126.95 = 768.15/x
3. Step 3: Cross multiply
   2,085.30x = 3,126.95 × 768.15
4. Step 4: Simplify right side
   2,085.30x = 2,401,966.64
5. Step 5: Solve for x
   x = 2,401,966.64/2,085.30
6. Step 6: Final answer
   x = 1,151.86