Finding the Fourth Proportional to 21,600.72, 29,812.86 and 12,647.70

Step by Step Solution

1. Step 1: Write the proportion equation
   21,600.72 : 29,812.86 = 12,647.70 : x
2. Step 2: Convert to fraction form
   21,600.72/29,812.86 = 12,647.70/x
3. Step 3: Cross multiply
   21,600.72x = 29,812.86 × 12,647.70
4. Step 4: Simplify right side
   21,600.72x = 377,064,109.42
5. Step 5: Solve for x
   x = 377,064,109.42/21,600.72
6. Step 6: Final answer
   x = 17,456.09