Finding the Fourth Proportional to 22,385.71, 30,879.39 and 13,428.01

Step by Step Solution

1. Step 1: Write the proportion equation
   22,385.71 : 30,879.39 = 13,428.01 : x
2. Step 2: Convert to fraction form
   22,385.71/30,879.39 = 13,428.01/x
3. Step 3: Cross multiply
   22,385.71x = 30,879.39 × 13,428.01
4. Step 4: Simplify right side
   22,385.71x = 414,648,757.71
5. Step 5: Solve for x
   x = 414,648,757.71/22,385.71
6. Step 6: Final answer
   x = 18,522.92