Finding the Fourth Proportional to 2,662.76, 3,990.70 and 1,839.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.76 : 3,990.70 = 1,839.72 : x
2. Step 2: Convert to fraction form
   2,662.76/3,990.70 = 1,839.72/x
3. Step 3: Cross multiply
   2,662.76x = 3,990.70 × 1,839.72
4. Step 4: Simplify right side
   2,662.76x = 7,341,770.60
5. Step 5: Solve for x
   x = 7,341,770.60/2,662.76
6. Step 6: Final answer
   x = 2,757.20