Finding the Fourth Proportional to 42,481.23, 63,717.72 and 12,899.33

Step by Step Solution

1. Step 1: Write the proportion equation
   42,481.23 : 63,717.72 = 12,899.33 : x
2. Step 2: Convert to fraction form
   42,481.23/63,717.72 = 12,899.33/x
3. Step 3: Cross multiply
   42,481.23x = 63,717.72 × 12,899.33
4. Step 4: Simplify right side
   42,481.23x = 821,915,578.54
5. Step 5: Solve for x
   x = 821,915,578.54/42,481.23
6. Step 6: Final answer
   x = 19,347.73