Finding the Fourth Proportional to 21,012.62, 31,523.41 and 10,488.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,012.62 : 31,523.41 = 10,488.30 : x
2. Step 2: Convert to fraction form
   21,012.62/31,523.41 = 10,488.30/x
3. Step 3: Cross multiply
   21,012.62x = 31,523.41 × 10,488.30
4. Step 4: Simplify right side
   21,012.62x = 330,626,981.10
5. Step 5: Solve for x
   x = 330,626,981.10/21,012.62
6. Step 6: Final answer
   x = 15,734.69