Finding the Third Proportional to 11,086.31 and 13,136.63

Step by Step Solution

1. Step 1: Write the proportion equation
   11,086.31 : 13,136.63 = 13,136.63 : x
2. Step 2: Convert to fraction form
   11,086.31/13,136.63 = 13,136.63/x
3. Step 3: Cross multiply
   11,086.31x = 13,136.63 × 13,136.63
4. Step 4: Simplify right side
   11,086.31x = 172,570,916.39
5. Step 5: Solve for x
   x = 172,570,916.39/11,086.31
6. Step 6: Final answer
   x = 15,566.12