Finding the Fourth Proportional to 21,309.32, 29,410.32 and 12,820.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,309.32 : 29,410.32 = 12,820.02 : x
2. Step 2: Convert to fraction form
   21,309.32/29,410.32 = 12,820.02/x
3. Step 3: Cross multiply
   21,309.32x = 29,410.32 × 12,820.02
4. Step 4: Simplify right side
   21,309.32x = 377,040,780.32
5. Step 5: Solve for x
   x = 377,040,780.32/21,309.32
6. Step 6: Final answer
   x = 17,693.71