Finding the Fourth Proportional to 2,765.49, 3,812.31 and 1,978.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,765.49 : 3,812.31 = 1,978.17 : x
2. Step 2: Convert to fraction form
   2,765.49/3,812.31 = 1,978.17/x
3. Step 3: Cross multiply
   2,765.49x = 3,812.31 × 1,978.17
4. Step 4: Simplify right side
   2,765.49x = 7,541,397.27
5. Step 5: Solve for x
   x = 7,541,397.27/2,765.49
6. Step 6: Final answer
   x = 2,726.97