Finding the Fourth Proportional to 21,380.38, 32,077.49 and 10,285.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,380.38 : 32,077.49 = 10,285.63 : x
2. Step 2: Convert to fraction form
   21,380.38/32,077.49 = 10,285.63/x
3. Step 3: Cross multiply
   21,380.38x = 32,077.49 × 10,285.63
4. Step 4: Simplify right side
   21,380.38x = 329,936,981.65
5. Step 5: Solve for x
   x = 329,936,981.65/21,380.38
6. Step 6: Final answer
   x = 15,431.77