Finding the Fourth Proportional to 15,697, 21,666.72 and 10,108

Step by Step Solution

1. Step 1: Write the proportion equation
   15,697 : 21,666.72 = 10,108 : x
2. Step 2: Convert to fraction form
   15,697/21,666.72 = 10,108/x
3. Step 3: Cross multiply
   15,697x = 21,666.72 × 10,108
4. Step 4: Simplify right side
   15,697x = 219,007,205.76
5. Step 5: Solve for x
   x = 219,007,205.76/15,697
6. Step 6: Final answer
   x = 13,952.17