Finding the Fourth Proportional to 10,552.14, 14,628.54 and 9,990.35

Step by Step Solution

1. Step 1: Write the proportion equation
   10,552.14 : 14,628.54 = 9,990.35 : x
2. Step 2: Convert to fraction form
   10,552.14/14,628.54 = 9,990.35/x
3. Step 3: Cross multiply
   10,552.14x = 14,628.54 × 9,990.35
4. Step 4: Simplify right side
   10,552.14x = 146,144,234.59
5. Step 5: Solve for x
   x = 146,144,234.59/10,552.14
6. Step 6: Final answer
   x = 13,849.72