Finding the Fourth Proportional to 12,381.47, 18,572.56 and 3,147.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,381.47 : 18,572.56 = 3,147.47 : x
2. Step 2: Convert to fraction form
   12,381.47/18,572.56 = 3,147.47/x
3. Step 3: Cross multiply
   12,381.47x = 18,572.56 × 3,147.47
4. Step 4: Simplify right side
   12,381.47x = 58,456,474.69
5. Step 5: Solve for x
   x = 58,456,474.69/12,381.47
6. Step 6: Final answer
   x = 4,721.29