Finding the Third Proportional to 12,287.64 and 21,172.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,287.64 : 21,172.32 = 21,172.32 : x
2. Step 2: Convert to fraction form
   12,287.64/21,172.32 = 21,172.32/x
3. Step 3: Cross multiply
   12,287.64x = 21,172.32 × 21,172.32
4. Step 4: Simplify right side
   12,287.64x = 448,267,312.82
5. Step 5: Solve for x
   x = 448,267,312.82/12,287.64
6. Step 6: Final answer
   x = 36,481.17