Finding the Fourth Proportional to 3,147.69, 4,721.69 and 1,200.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,147.69 : 4,721.69 = 1,200.05 : x
2. Step 2: Convert to fraction form
   3,147.69/4,721.69 = 1,200.05/x
3. Step 3: Cross multiply
   3,147.69x = 4,721.69 × 1,200.05
4. Step 4: Simplify right side
   3,147.69x = 5,666,243.48
5. Step 5: Solve for x
   x = 5,666,243.48/3,147.69
6. Step 6: Final answer
   x = 1,800.13