Finding the Fourth Proportional to 15,485, 21,369.69 and 8,411.42

Step by Step Solution

1. Step 1: Write the proportion equation
   15,485 : 21,369.69 = 8,411.42 : x
2. Step 2: Convert to fraction form
   15,485/21,369.69 = 8,411.42/x
3. Step 3: Cross multiply
   15,485x = 21,369.69 × 8,411.42
4. Step 4: Simplify right side
   15,485x = 179,749,437.86
5. Step 5: Solve for x
   x = 179,749,437.86/15,485
6. Step 6: Final answer
   x = 11,607.97