Finding the Fourth Proportional to 21,020.76, 29,009.88 and 12,068.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,020.76 : 29,009.88 = 12,068.28 : x
2. Step 2: Convert to fraction form
   21,020.76/29,009.88 = 12,068.28/x
3. Step 3: Cross multiply
   21,020.76x = 29,009.88 × 12,068.28
4. Step 4: Simplify right side
   21,020.76x = 350,099,354.61
5. Step 5: Solve for x
   x = 350,099,354.61/21,020.76
6. Step 6: Final answer
   x = 16,654.93