Finding the Fourth Proportional to 21,002.32, 28,976.99 and 12,497.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,002.32 : 28,976.99 = 12,497.63 : x
2. Step 2: Convert to fraction form
   21,002.32/28,976.99 = 12,497.63/x
3. Step 3: Cross multiply
   21,002.32x = 28,976.99 × 12,497.63
4. Step 4: Simplify right side
   21,002.32x = 362,143,492.16
5. Step 5: Solve for x
   x = 362,143,492.16/21,002.32
6. Step 6: Final answer
   x = 17,243.02