Finding the Fourth Proportional to 12,896.43, 19,362.47 and 6,661.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,896.43 : 19,362.47 = 6,661.59 : x
2. Step 2: Convert to fraction form
   12,896.43/19,362.47 = 6,661.59/x
3. Step 3: Cross multiply
   12,896.43x = 19,362.47 × 6,661.59
4. Step 4: Simplify right side
   12,896.43x = 128,984,803.22
5. Step 5: Solve for x
   x = 128,984,803.22/12,896.43
6. Step 6: Final answer
   x = 10,001.59