Finding the Fourth Proportional to 1,986.78, 2,740.21 and 1,322.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.78 : 2,740.21 = 1,322.48 : x
2. Step 2: Convert to fraction form
   1,986.78/2,740.21 = 1,322.48/x
3. Step 3: Cross multiply
   1,986.78x = 2,740.21 × 1,322.48
4. Step 4: Simplify right side
   1,986.78x = 3,623,859.22
5. Step 5: Solve for x
   x = 3,623,859.22/1,986.78
6. Step 6: Final answer
   x = 1,823.99