Finding the Fourth Proportional to 12,721.48, 19,061.47 and 6,472.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,721.48 : 19,061.47 = 6,472.90 : x
2. Step 2: Convert to fraction form
   12,721.48/19,061.47 = 6,472.90/x
3. Step 3: Cross multiply
   12,721.48x = 19,061.47 × 6,472.90
4. Step 4: Simplify right side
   12,721.48x = 123,382,981.76
5. Step 5: Solve for x
   x = 123,382,981.76/12,721.48
6. Step 6: Final answer
   x = 9,698.79