Finding the Fourth Proportional to 2,713.62, 4,070.49 and 765.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,713.62 : 4,070.49 = 765.78 : x
2. Step 2: Convert to fraction form
   2,713.62/4,070.49 = 765.78/x
3. Step 3: Cross multiply
   2,713.62x = 4,070.49 × 765.78
4. Step 4: Simplify right side
   2,713.62x = 3,117,099.83
5. Step 5: Solve for x
   x = 3,117,099.83/2,713.62
6. Step 6: Final answer
   x = 1,148.69