Finding the Fourth Proportional to 10,474.17, 14,456.10 and 10,128.05

Step by Step Solution

1. Step 1: Write the proportion equation
   10,474.17 : 14,456.10 = 10,128.05 : x
2. Step 2: Convert to fraction form
   10,474.17/14,456.10 = 10,128.05/x
3. Step 3: Cross multiply
   10,474.17x = 14,456.10 × 10,128.05
4. Step 4: Simplify right side
   10,474.17x = 146,412,103.61
5. Step 5: Solve for x
   x = 146,412,103.61/10,474.17
6. Step 6: Final answer
   x = 13,978.40