Finding the Fourth Proportional to 21,091.63, 29,109.03 and 12,020.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,091.63 : 29,109.03 = 12,020.34 : x
2. Step 2: Convert to fraction form
   21,091.63/29,109.03 = 12,020.34/x
3. Step 3: Cross multiply
   21,091.63x = 29,109.03 × 12,020.34
4. Step 4: Simplify right side
   21,091.63x = 349,900,437.67
5. Step 5: Solve for x
   x = 349,900,437.67/21,091.63
6. Step 6: Final answer
   x = 16,589.54