Finding the Third Proportional to 9,478 and 12,985

Step by Step Solution

1. Step 1: Write the proportion equation
   9,478 : 12,985 = 12,985 : x
2. Step 2: Convert to fraction form
   9,478/12,985 = 12,985/x
3. Step 3: Cross multiply
   9,478x = 12,985 × 12,985
4. Step 4: Simplify right side
   9,478x = 168,610,225
5. Step 5: Solve for x
   x = 168,610,225/9,478
6. Step 6: Final answer
   x = 17,789.64