Finding the Fourth Proportional to 15,465.47, 21,342.59 and 8,391.89

Step by Step Solution

1. Step 1: Write the proportion equation
   15,465.47 : 21,342.59 = 8,391.89 : x
2. Step 2: Convert to fraction form
   15,465.47/21,342.59 = 8,391.89/x
3. Step 3: Cross multiply
   15,465.47x = 21,342.59 × 8,391.89
4. Step 4: Simplify right side
   15,465.47x = 179,104,667.60
5. Step 5: Solve for x
   x = 179,104,667.60/15,465.47
6. Step 6: Final answer
   x = 11,580.94