Finding the Fourth Proportional to 21,063.84, 29,059.04 and 12,109.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,063.84 : 29,059.04 = 12,109.28 : x
2. Step 2: Convert to fraction form
   21,063.84/29,059.04 = 12,109.28/x
3. Step 3: Cross multiply
   21,063.84x = 29,059.04 × 12,109.28
4. Step 4: Simplify right side
   21,063.84x = 351,884,051.89
5. Step 5: Solve for x
   x = 351,884,051.89/21,063.84
6. Step 6: Final answer
   x = 16,705.60