Finding the Fourth Proportional to 21,887.47, 30,206.01 and 12,456.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,887.47 : 30,206.01 = 12,456.10 : x
2. Step 2: Convert to fraction form
   21,887.47/30,206.01 = 12,456.10/x
3. Step 3: Cross multiply
   21,887.47x = 30,206.01 × 12,456.10
4. Step 4: Simplify right side
   21,887.47x = 376,249,081.16
5. Step 5: Solve for x
   x = 376,249,081.16/21,887.47
6. Step 6: Final answer
   x = 17,190.16