Finding the Fourth Proportional to 3,769.25, 5,631.56 and 3,640.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,769.25 : 5,631.56 = 3,640.05 : x
2. Step 2: Convert to fraction form
   3,769.25/5,631.56 = 3,640.05/x
3. Step 3: Cross multiply
   3,769.25x = 5,631.56 × 3,640.05
4. Step 4: Simplify right side
   3,769.25x = 20,499,141.78
5. Step 5: Solve for x
   x = 20,499,141.78/3,769.25
6. Step 6: Final answer
   x = 5,438.53