Finding the Fourth Proportional to 21,259.95, 31,881.69 and 7,217.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,259.95 : 31,881.69 = 7,217.61 : x
2. Step 2: Convert to fraction form
   21,259.95/31,881.69 = 7,217.61/x
3. Step 3: Cross multiply
   21,259.95x = 31,881.69 × 7,217.61
4. Step 4: Simplify right side
   21,259.95x = 230,109,604.56
5. Step 5: Solve for x
   x = 230,109,604.56/21,259.95
6. Step 6: Final answer
   x = 10,823.62