Finding the Fourth Proportional to 12,640.20, 17,437.89 and 7,601.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,640.20 : 17,437.89 = 7,601.49 : x
2. Step 2: Convert to fraction form
   12,640.20/17,437.89 = 7,601.49/x
3. Step 3: Cross multiply
   12,640.20x = 17,437.89 × 7,601.49
4. Step 4: Simplify right side
   12,640.20x = 132,553,946.46
5. Step 5: Solve for x
   x = 132,553,946.46/12,640.20
6. Step 6: Final answer
   x = 10,486.70