Finding the Third Proportional to 11,390 and 12,470

Step by Step Solution

1. Step 1: Write the proportion equation
   11,390 : 12,470 = 12,470 : x
2. Step 2: Convert to fraction form
   11,390/12,470 = 12,470/x
3. Step 3: Cross multiply
   11,390x = 12,470 × 12,470
4. Step 4: Simplify right side
   11,390x = 155,500,900
5. Step 5: Solve for x
   x = 155,500,900/11,390
6. Step 6: Final answer
   x = 13,652.41