Finding the Fourth Proportional to 21,019.84, 31,522.82 and 7,689.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019.84 : 31,522.82 = 7,689.80 : x
2. Step 2: Convert to fraction form
   21,019.84/31,522.82 = 7,689.80/x
3. Step 3: Cross multiply
   21,019.84x = 31,522.82 × 7,689.80
4. Step 4: Simplify right side
   21,019.84x = 242,404,221.59
5. Step 5: Solve for x
   x = 242,404,221.59/21,019.84
6. Step 6: Final answer
   x = 11,532.16