Finding the Fourth Proportional to 15,538.89, 21,443.48 and 8,465.16

Step by Step Solution

1. Step 1: Write the proportion equation
   15,538.89 : 21,443.48 = 8,465.16 : x
2. Step 2: Convert to fraction form
   15,538.89/21,443.48 = 8,465.16/x
3. Step 3: Cross multiply
   15,538.89x = 21,443.48 × 8,465.16
4. Step 4: Simplify right side
   15,538.89x = 181,522,446.83
5. Step 5: Solve for x
   x = 181,522,446.83/15,538.89
6. Step 6: Final answer
   x = 11,681.82