Finding the Fourth Proportional to 10,647.17, 14,678.78 and 7,456.17

Step by Step Solution

1. Step 1: Write the proportion equation
   10,647.17 : 14,678.78 = 7,456.17 : x
2. Step 2: Convert to fraction form
   10,647.17/14,678.78 = 7,456.17/x
3. Step 3: Cross multiply
   10,647.17x = 14,678.78 × 7,456.17
4. Step 4: Simplify right side
   10,647.17x = 109,447,441.79
5. Step 5: Solve for x
   x = 109,447,441.79/10,647.17
6. Step 6: Final answer
   x = 10,279.49