Finding the Fourth Proportional to 16,978.85, 25,419 and 10,384.91

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.85 : 25,419 = 10,384.91 : x
2. Step 2: Convert to fraction form
   16,978.85/25,419 = 10,384.91/x
3. Step 3: Cross multiply
   16,978.85x = 25,419 × 10,384.91
4. Step 4: Simplify right side
   16,978.85x = 263,974,027.29
5. Step 5: Solve for x
   x = 263,974,027.29/16,978.85
6. Step 6: Final answer
   x = 15,547.23