Finding the Fourth Proportional to 15,697.88, 21,662.99 and 8,624.15

Step by Step Solution

1. Step 1: Write the proportion equation
   15,697.88 : 21,662.99 = 8,624.15 : x
2. Step 2: Convert to fraction form
   15,697.88/21,662.99 = 8,624.15/x
3. Step 3: Cross multiply
   15,697.88x = 21,662.99 × 8,624.15
4. Step 4: Simplify right side
   15,697.88x = 186,824,886.25
5. Step 5: Solve for x
   x = 186,824,886.25/15,697.88
6. Step 6: Final answer
   x = 11,901.28