Finding the Fourth Proportional to 2,147.38, 3,221.46 and 760.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.38 : 3,221.46 = 760.78 : x
2. Step 2: Convert to fraction form
   2,147.38/3,221.46 = 760.78/x
3. Step 3: Cross multiply
   2,147.38x = 3,221.46 × 760.78
4. Step 4: Simplify right side
   2,147.38x = 2,450,822.34
5. Step 5: Solve for x
   x = 2,450,822.34/2,147.38
6. Step 6: Final answer
   x = 1,141.31