Finding the Fourth Proportional to 18,436.17, 25,441.89 and 10,478.40

Step by Step Solution

1. Step 1: Write the proportion equation
   18,436.17 : 25,441.89 = 10,478.40 : x
2. Step 2: Convert to fraction form
   18,436.17/25,441.89 = 10,478.40/x
3. Step 3: Cross multiply
   18,436.17x = 25,441.89 × 10,478.40
4. Step 4: Simplify right side
   18,436.17x = 266,590,300.18
5. Step 5: Solve for x
   x = 266,590,300.18/18,436.17
6. Step 6: Final answer
   x = 14,460.18