Finding the Fourth Proportional to 15,689.69, 21,654.83 and 9,724.01

Step by Step Solution

1. Step 1: Write the proportion equation
   15,689.69 : 21,654.83 = 9,724.01 : x
2. Step 2: Convert to fraction form
   15,689.69/21,654.83 = 9,724.01/x
3. Step 3: Cross multiply
   15,689.69x = 21,654.83 × 9,724.01
4. Step 4: Simplify right side
   15,689.69x = 210,571,699.50
5. Step 5: Solve for x
   x = 210,571,699.50/15,689.69
6. Step 6: Final answer
   x = 13,421.03