Finding the Fourth Proportional to 15,485.42, 21,368.81 and 8,411.69

Step by Step Solution

1. Step 1: Write the proportion equation
   15,485.42 : 21,368.81 = 8,411.69 : x
2. Step 2: Convert to fraction form
   15,485.42/21,368.81 = 8,411.69/x
3. Step 3: Cross multiply
   15,485.42x = 21,368.81 × 8,411.69
4. Step 4: Simplify right side
   15,485.42x = 179,747,698.54
5. Step 5: Solve for x
   x = 179,747,698.54/15,485.42
6. Step 6: Final answer
   x = 11,607.55