Finding the Fourth Proportional to 25,715.34, 35,487.45 and 15,105.15

Step by Step Solution

1. Step 1: Write the proportion equation
   25,715.34 : 35,487.45 = 15,105.15 : x
2. Step 2: Convert to fraction form
   25,715.34/35,487.45 = 15,105.15/x
3. Step 3: Cross multiply
   25,715.34x = 35,487.45 × 15,105.15
4. Step 4: Simplify right side
   25,715.34x = 536,043,255.37
5. Step 5: Solve for x
   x = 536,043,255.37/25,715.34
6. Step 6: Final answer
   x = 20,845.27