Finding the Fourth Proportional to 21,012.04, 28,996.74 and 12,059.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,012.04 : 28,996.74 = 12,059.31 : x
2. Step 2: Convert to fraction form
   21,012.04/28,996.74 = 12,059.31/x
3. Step 3: Cross multiply
   21,012.04x = 28,996.74 × 12,059.31
4. Step 4: Simplify right side
   21,012.04x = 349,680,616.35
5. Step 5: Solve for x
   x = 349,680,616.35/21,012.04
6. Step 6: Final answer
   x = 16,641.92