Finding the Fourth Proportional to 12,720.69, 19,084.46 and 5,321.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,720.69 : 19,084.46 = 5,321.25 : x
2. Step 2: Convert to fraction form
   12,720.69/19,084.46 = 5,321.25/x
3. Step 3: Cross multiply
   12,720.69x = 19,084.46 × 5,321.25
4. Step 4: Simplify right side
   12,720.69x = 101,553,156.17
5. Step 5: Solve for x
   x = 101,553,156.17/12,720.69
6. Step 6: Final answer
   x = 7,983.31