Finding the Fourth Proportional to 12,999.69, 19,480.82 and 10,064.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,999.69 : 19,480.82 = 10,064.25 : x
2. Step 2: Convert to fraction form
   12,999.69/19,480.82 = 10,064.25/x
3. Step 3: Cross multiply
   12,999.69x = 19,480.82 × 10,064.25
4. Step 4: Simplify right side
   12,999.69x = 196,059,792.36
5. Step 5: Solve for x
   x = 196,059,792.36/12,999.69
6. Step 6: Final answer
   x = 15,081.88