Finding the Fourth Proportional to 21,105.87, 31,660.47 and 7,065.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.87 : 31,660.47 = 7,065.98 : x
2. Step 2: Convert to fraction form
   21,105.87/31,660.47 = 7,065.98/x
3. Step 3: Cross multiply
   21,105.87x = 31,660.47 × 7,065.98
4. Step 4: Simplify right side
   21,105.87x = 223,712,247.81
5. Step 5: Solve for x
   x = 223,712,247.81/21,105.87
6. Step 6: Final answer
   x = 10,599.53