Finding the Fourth Proportional to 1,986.62, 2,740.90 and 1,147.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.62 : 2,740.90 = 1,147.21 : x
2. Step 2: Convert to fraction form
   1,986.62/2,740.90 = 1,147.21/x
3. Step 3: Cross multiply
   1,986.62x = 2,740.90 × 1,147.21
4. Step 4: Simplify right side
   1,986.62x = 3,144,387.89
5. Step 5: Solve for x
   x = 3,144,387.89/1,986.62
6. Step 6: Final answer
   x = 1,582.78