Finding the Fourth Proportional to 15,662.86, 21,608.80 and 9,997.82

Step by Step Solution

1. Step 1: Write the proportion equation
   15,662.86 : 21,608.80 = 9,997.82 : x
2. Step 2: Convert to fraction form
   15,662.86/21,608.80 = 9,997.82/x
3. Step 3: Cross multiply
   15,662.86x = 21,608.80 × 9,997.82
4. Step 4: Simplify right side
   15,662.86x = 216,040,892.82
5. Step 5: Solve for x
   x = 216,040,892.82/15,662.86
6. Step 6: Final answer
   x = 13,793.20