Finding the Fourth Proportional to 21,406.83, 29,547.37 and 12,456.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,406.83 : 29,547.37 = 12,456.07 : x
2. Step 2: Convert to fraction form
   21,406.83/29,547.37 = 12,456.07/x
3. Step 3: Cross multiply
   21,406.83x = 29,547.37 × 12,456.07
4. Step 4: Simplify right side
   21,406.83x = 368,044,124.61
5. Step 5: Solve for x
   x = 368,044,124.61/21,406.83
6. Step 6: Final answer
   x = 17,192.84