Finding the Fourth Proportional to 22,131.05, 30,539.70 and 12,699

Step by Step Solution

1. Step 1: Write the proportion equation
   22,131.05 : 30,539.70 = 12,699 : x
2. Step 2: Convert to fraction form
   22,131.05/30,539.70 = 12,699/x
3. Step 3: Cross multiply
   22,131.05x = 30,539.70 × 12,699
4. Step 4: Simplify right side
   22,131.05x = 387,823,650.30
5. Step 5: Solve for x
   x = 387,823,650.30/22,131.05
6. Step 6: Final answer
   x = 17,523.96