Finding the Third Proportional to 9,128 and 12,931

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128 : 12,931 = 12,931 : x
2. Step 2: Convert to fraction form
   9,128/12,931 = 12,931/x
3. Step 3: Cross multiply
   9,128x = 12,931 × 12,931
4. Step 4: Simplify right side
   9,128x = 167,210,761
5. Step 5: Solve for x
   x = 167,210,761/9,128
6. Step 6: Final answer
   x = 18,318.44