Finding the Fourth Proportional to 2,151.86, 3,227.87 and 765.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.86 : 3,227.87 = 765.18 : x
2. Step 2: Convert to fraction form
   2,151.86/3,227.87 = 765.18/x
3. Step 3: Cross multiply
   2,151.86x = 3,227.87 × 765.18
4. Step 4: Simplify right side
   2,151.86x = 2,469,897.74
5. Step 5: Solve for x
   x = 2,469,897.74/2,151.86
6. Step 6: Final answer
   x = 1,147.80