Finding the Fourth Proportional to 21,066.21, 29,068.56 and 12,569.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,066.21 : 29,068.56 = 12,569.31 : x
2. Step 2: Convert to fraction form
   21,066.21/29,068.56 = 12,569.31/x
3. Step 3: Cross multiply
   21,066.21x = 29,068.56 × 12,569.31
4. Step 4: Simplify right side
   21,066.21x = 365,371,741.89
5. Step 5: Solve for x
   x = 365,371,741.89/21,066.21
6. Step 6: Final answer
   x = 17,343.97