Finding the Fourth Proportional to 3,699.37, 5,106.23 and 2,128.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,699.37 : 5,106.23 = 2,128.57 : x
2. Step 2: Convert to fraction form
   3,699.37/5,106.23 = 2,128.57/x
3. Step 3: Cross multiply
   3,699.37x = 5,106.23 × 2,128.57
4. Step 4: Simplify right side
   3,699.37x = 10,868,957.35
5. Step 5: Solve for x
   x = 10,868,957.35/3,699.37
6. Step 6: Final answer
   x = 2,938.06