Finding the Fourth Proportional to 21,304.32, 29,400.06 and 12,357.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,304.32 : 29,400.06 = 12,357.12 : x
2. Step 2: Convert to fraction form
   21,304.32/29,400.06 = 12,357.12/x
3. Step 3: Cross multiply
   21,304.32x = 29,400.06 × 12,357.12
4. Step 4: Simplify right side
   21,304.32x = 363,300,069.43
5. Step 5: Solve for x
   x = 363,300,069.43/21,304.32
6. Step 6: Final answer
   x = 17,052.88