Finding the Fourth Proportional to 21,053.99, 31,570.43 and 7,009.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,053.99 : 31,570.43 = 7,009.07 : x
2. Step 2: Convert to fraction form
   21,053.99/31,570.43 = 7,009.07/x
3. Step 3: Cross multiply
   21,053.99x = 31,570.43 × 7,009.07
4. Step 4: Simplify right side
   21,053.99x = 221,279,160.90
5. Step 5: Solve for x
   x = 221,279,160.90/21,053.99
6. Step 6: Final answer
   x = 10,510.08