Finding the Fourth Proportional to 21,061.60, 31,588.94 and 7,020.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.60 : 31,588.94 = 7,020.38 : x
2. Step 2: Convert to fraction form
   21,061.60/31,588.94 = 7,020.38/x
3. Step 3: Cross multiply
   21,061.60x = 31,588.94 × 7,020.38
4. Step 4: Simplify right side
   21,061.60x = 221,766,362.60
5. Step 5: Solve for x
   x = 221,766,362.60/21,061.60
6. Step 6: Final answer
   x = 10,529.42