Finding the Fourth Proportional to 15,530.38, 21,431.71 and 8,456.81

Step by Step Solution

1. Step 1: Write the proportion equation
   15,530.38 : 21,431.71 = 8,456.81 : x
2. Step 2: Convert to fraction form
   15,530.38/21,431.71 = 8,456.81/x
3. Step 3: Cross multiply
   15,530.38x = 21,431.71 × 8,456.81
4. Step 4: Simplify right side
   15,530.38x = 181,243,899.45
5. Step 5: Solve for x
   x = 181,243,899.45/15,530.38
6. Step 6: Final answer
   x = 11,670.28