Finding the Fourth Proportional to 16,978.48, 23,421 and 10,260.88

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.48 : 23,421 = 10,260.88 : x
2. Step 2: Convert to fraction form
   16,978.48/23,421 = 10,260.88/x
3. Step 3: Cross multiply
   16,978.48x = 23,421 × 10,260.88
4. Step 4: Simplify right side
   16,978.48x = 240,320,070.48
5. Step 5: Solve for x
   x = 240,320,070.48/16,978.48
6. Step 6: Final answer
   x = 14,154.39