Finding the Fourth Proportional to 22,456.81, 30,992.49 and 12,898.03

Step by Step Solution

1. Step 1: Write the proportion equation
   22,456.81 : 30,992.49 = 12,898.03 : x
2. Step 2: Convert to fraction form
   22,456.81/30,992.49 = 12,898.03/x
3. Step 3: Cross multiply
   22,456.81x = 30,992.49 × 12,898.03
4. Step 4: Simplify right side
   22,456.81x = 399,742,065.79
5. Step 5: Solve for x
   x = 399,742,065.79/22,456.81
6. Step 6: Final answer
   x = 17,800.48