Finding the Fourth Proportional to 21,898.32, 30,224.52 and 13,402.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,898.32 : 30,224.52 = 13,402.32 : x
2. Step 2: Convert to fraction form
   21,898.32/30,224.52 = 13,402.32/x
3. Step 3: Cross multiply
   21,898.32x = 30,224.52 × 13,402.32
4. Step 4: Simplify right side
   21,898.32x = 405,078,688.89
5. Step 5: Solve for x
   x = 405,078,688.89/21,898.32
6. Step 6: Final answer
   x = 18,498.16