Finding the Third Proportional to 11,391 and 12,615

Step by Step Solution

1. Step 1: Write the proportion equation
   11,391 : 12,615 = 12,615 : x
2. Step 2: Convert to fraction form
   11,391/12,615 = 12,615/x
3. Step 3: Cross multiply
   11,391x = 12,615 × 12,615
4. Step 4: Simplify right side
   11,391x = 159,138,225
5. Step 5: Solve for x
   x = 159,138,225/11,391
6. Step 6: Final answer
   x = 13,970.52