Finding the Third Proportional to 9,013.78 and 12,386.67

Step by Step Solution

1. Step 1: Write the proportion equation
   9,013.78 : 12,386.67 = 12,386.67 : x
2. Step 2: Convert to fraction form
   9,013.78/12,386.67 = 12,386.67/x
3. Step 3: Cross multiply
   9,013.78x = 12,386.67 × 12,386.67
4. Step 4: Simplify right side
   9,013.78x = 153,429,640.14
5. Step 5: Solve for x
   x = 153,429,640.14/9,013.78
6. Step 6: Final answer
   x = 17,021.67