Finding the Fourth Proportional to 30,643.69, 45,968.18 and 8,457.07

Step by Step Solution

1. Step 1: Write the proportion equation
   30,643.69 : 45,968.18 = 8,457.07 : x
2. Step 2: Convert to fraction form
   30,643.69/45,968.18 = 8,457.07/x
3. Step 3: Cross multiply
   30,643.69x = 45,968.18 × 8,457.07
4. Step 4: Simplify right side
   30,643.69x = 388,755,843.91
5. Step 5: Solve for x
   x = 388,755,843.91/30,643.69
6. Step 6: Final answer
   x = 12,686.33