Finding the Fourth Proportional to 19,688.38, 27,167.34 and 12,624.40

Step by Step Solution

1. Step 1: Write the proportion equation
   19,688.38 : 27,167.34 = 12,624.40 : x
2. Step 2: Convert to fraction form
   19,688.38/27,167.34 = 12,624.40/x
3. Step 3: Cross multiply
   19,688.38x = 27,167.34 × 12,624.40
4. Step 4: Simplify right side
   19,688.38x = 342,971,367.10
5. Step 5: Solve for x
   x = 342,971,367.10/19,688.38
6. Step 6: Final answer
   x = 17,419.99