Finding the Fourth Proportional to 21,065.32, 29,066.34 and 13,609

Step by Step Solution

1. Step 1: Write the proportion equation
   21,065.32 : 29,066.34 = 13,609 : x
2. Step 2: Convert to fraction form
   21,065.32/29,066.34 = 13,609/x
3. Step 3: Cross multiply
   21,065.32x = 29,066.34 × 13,609
4. Step 4: Simplify right side
   21,065.32x = 395,563,821.06
5. Step 5: Solve for x
   x = 395,563,821.06/21,065.32
6. Step 6: Final answer
   x = 18,777.96