Finding the Fourth Proportional to 1,808.89, 2,713.47 and 768.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,808.89 : 2,713.47 = 768.78 : x
2. Step 2: Convert to fraction form
   1,808.89/2,713.47 = 768.78/x
3. Step 3: Cross multiply
   1,808.89x = 2,713.47 × 768.78
4. Step 4: Simplify right side
   1,808.89x = 2,086,061.47
5. Step 5: Solve for x
   x = 2,086,061.47/1,808.89
6. Step 6: Final answer
   x = 1,153.23