Finding the Fourth Proportional to 3,700.47, 5,107.22 and 2,128.47

Step by Step Solution

1. Step 1: Write the proportion equation
   3,700.47 : 5,107.22 = 2,128.47 : x
2. Step 2: Convert to fraction form
   3,700.47/5,107.22 = 2,128.47/x
3. Step 3: Cross multiply
   3,700.47x = 5,107.22 × 2,128.47
4. Step 4: Simplify right side
   3,700.47x = 10,870,564.55
5. Step 5: Solve for x
   x = 10,870,564.55/3,700.47
6. Step 6: Final answer
   x = 2,937.62