Finding the Fourth Proportional to 18,209.72, 25,128.58 and 10,142.94

Step by Step Solution

1. Step 1: Write the proportion equation
   18,209.72 : 25,128.58 = 10,142.94 : x
2. Step 2: Convert to fraction form
   18,209.72/25,128.58 = 10,142.94/x
3. Step 3: Cross multiply
   18,209.72x = 25,128.58 × 10,142.94
4. Step 4: Simplify right side
   18,209.72x = 254,877,679.23
5. Step 5: Solve for x
   x = 254,877,679.23/18,209.72
6. Step 6: Final answer
   x = 13,996.79