Finding the Fourth Proportional to 22,130.94, 30,540.42 and 12,699.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,130.94 : 30,540.42 = 12,699.30 : x
2. Step 2: Convert to fraction form
   22,130.94/30,540.42 = 12,699.30/x
3. Step 3: Cross multiply
   22,130.94x = 30,540.42 × 12,699.30
4. Step 4: Simplify right side
   22,130.94x = 387,841,955.71
5. Step 5: Solve for x
   x = 387,841,955.71/22,130.94
6. Step 6: Final answer
   x = 17,524.87