Finding the Fourth Proportional to 15,495.69, 21,383.60 and 8,781.94

Step by Step Solution

1. Step 1: Write the proportion equation
   15,495.69 : 21,383.60 = 8,781.94 : x
2. Step 2: Convert to fraction form
   15,495.69/21,383.60 = 8,781.94/x
3. Step 3: Cross multiply
   15,495.69x = 21,383.60 × 8,781.94
4. Step 4: Simplify right side
   15,495.69x = 187,789,404.12
5. Step 5: Solve for x
   x = 187,789,404.12/15,495.69
6. Step 6: Final answer
   x = 12,118.82