Finding the Fourth Proportional to 12,372.50, 17,076.78 and 9,678.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,372.50 : 17,076.78 = 9,678.38 : x
2. Step 2: Convert to fraction form
   12,372.50/17,076.78 = 9,678.38/x
3. Step 3: Cross multiply
   12,372.50x = 17,076.78 × 9,678.38
4. Step 4: Simplify right side
   12,372.50x = 165,275,566.02
5. Step 5: Solve for x
   x = 165,275,566.02/12,372.50
6. Step 6: Final answer
   x = 13,358.30