Finding the Fourth Proportional to 25,586.72, 38,354.16 and 12,428

Step by Step Solution

1. Step 1: Write the proportion equation
   25,586.72 : 38,354.16 = 12,428 : x
2. Step 2: Convert to fraction form
   25,586.72/38,354.16 = 12,428/x
3. Step 3: Cross multiply
   25,586.72x = 38,354.16 × 12,428
4. Step 4: Simplify right side
   25,586.72x = 476,665,500.48
5. Step 5: Solve for x
   x = 476,665,500.48/25,586.72
6. Step 6: Final answer
   x = 18,629.41