Finding the Fourth Proportional to 42,002.56, 62,960.64 and 18,640

Step by Step Solution

1. Step 1: Write the proportion equation
   42,002.56 : 62,960.64 = 18,640 : x
2. Step 2: Convert to fraction form
   42,002.56/62,960.64 = 18,640/x
3. Step 3: Cross multiply
   42,002.56x = 62,960.64 × 18,640
4. Step 4: Simplify right side
   42,002.56x = 1,173,586,329.60
5. Step 5: Solve for x
   x = 1,173,586,329.60/42,002.56
6. Step 6: Final answer
   x = 27,940.83