Finding the Fourth Proportional to 21,012.99, 29,011.43 and 13,066.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,012.99 : 29,011.43 = 13,066.02 : x
2. Step 2: Convert to fraction form
   21,012.99/29,011.43 = 13,066.02/x
3. Step 3: Cross multiply
   21,012.99x = 29,011.43 × 13,066.02
4. Step 4: Simplify right side
   21,012.99x = 379,063,859.28
5. Step 5: Solve for x
   x = 379,063,859.28/21,012.99
6. Step 6: Final answer
   x = 18,039.50