Finding the Fourth Proportional to 30,786.89, 42,457.56 and 19,436.66

Step by Step Solution

1. Step 1: Write the proportion equation
   30,786.89 : 42,457.56 = 19,436.66 : x
2. Step 2: Convert to fraction form
   30,786.89/42,457.56 = 19,436.66/x
3. Step 3: Cross multiply
   30,786.89x = 42,457.56 × 19,436.66
4. Step 4: Simplify right side
   30,786.89x = 825,233,060.97
5. Step 5: Solve for x
   x = 825,233,060.97/30,786.89
6. Step 6: Final answer
   x = 26,804.69