Finding the Fourth Proportional to 21,057.63, 31,575.86 and 7,012.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,057.63 : 31,575.86 = 7,012.69 : x
2. Step 2: Convert to fraction form
   21,057.63/31,575.86 = 7,012.69/x
3. Step 3: Cross multiply
   21,057.63x = 31,575.86 × 7,012.69
4. Step 4: Simplify right side
   21,057.63x = 221,431,735.20
5. Step 5: Solve for x
   x = 221,431,735.20/21,057.63
6. Step 6: Final answer
   x = 10,515.51