Finding the Fourth Proportional to 21,063.33, 29,069.87 and 12,111.21

Step by Step Solution

1. Step 1: Write the proportion equation
   21,063.33 : 29,069.87 = 12,111.21 : x
2. Step 2: Convert to fraction form
   21,063.33/29,069.87 = 12,111.21/x
3. Step 3: Cross multiply
   21,063.33x = 29,069.87 × 12,111.21
4. Step 4: Simplify right side
   21,063.33x = 352,071,300.24
5. Step 5: Solve for x
   x = 352,071,300.24/21,063.33
6. Step 6: Final answer
   x = 16,714.89