Finding the Fourth Proportional to 21,012.38, 28,995.29 and 12,059.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,012.38 : 28,995.29 = 12,059.69 : x
2. Step 2: Convert to fraction form
   21,012.38/28,995.29 = 12,059.69/x
3. Step 3: Cross multiply
   21,012.38x = 28,995.29 × 12,059.69
4. Step 4: Simplify right side
   21,012.38x = 349,674,208.86
5. Step 5: Solve for x
   x = 349,674,208.86/21,012.38
6. Step 6: Final answer
   x = 16,641.34