Finding the Fourth Proportional to 21,052.31, 31,571.89 and 7,009.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,052.31 : 31,571.89 = 7,009.06 : x
2. Step 2: Convert to fraction form
   21,052.31/31,571.89 = 7,009.06/x
3. Step 3: Cross multiply
   21,052.31x = 31,571.89 × 7,009.06
4. Step 4: Simplify right side
   21,052.31x = 221,289,271.32
5. Step 5: Solve for x
   x = 221,289,271.32/21,052.31
6. Step 6: Final answer
   x = 10,511.40