Finding the Fourth Proportional to 21,075.61, 31,631.15 and 10,542.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,075.61 : 31,631.15 = 10,542.47 : x
2. Step 2: Convert to fraction form
   21,075.61/31,631.15 = 10,542.47/x
3. Step 3: Cross multiply
   21,075.61x = 31,631.15 × 10,542.47
4. Step 4: Simplify right side
   21,075.61x = 333,470,397.23
5. Step 5: Solve for x
   x = 333,470,397.23/21,075.61
6. Step 6: Final answer
   x = 15,822.58