Finding the Fourth Proportional to 22,405.72, 30,916.03 and 13,458.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,405.72 : 30,916.03 = 13,458.15 : x
2. Step 2: Convert to fraction form
   22,405.72/30,916.03 = 13,458.15/x
3. Step 3: Cross multiply
   22,405.72x = 30,916.03 × 13,458.15
4. Step 4: Simplify right side
   22,405.72x = 416,072,569.14
5. Step 5: Solve for x
   x = 416,072,569.14/22,405.72
6. Step 6: Final answer
   x = 18,569.93