Finding the Fourth Proportional to 12,109.08, 16,721.46 and 7,640.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.08 : 16,721.46 = 7,640.76 : x
2. Step 2: Convert to fraction form
   12,109.08/16,721.46 = 7,640.76/x
3. Step 3: Cross multiply
   12,109.08x = 16,721.46 × 7,640.76
4. Step 4: Simplify right side
   12,109.08x = 127,764,662.71
5. Step 5: Solve for x
   x = 127,764,662.71/12,109.08
6. Step 6: Final answer
   x = 10,551.15