Finding the Third Proportional to 15,445.69 and 20,978.16

Step by Step Solution

1. Step 1: Write the proportion equation
   15,445.69 : 20,978.16 = 20,978.16 : x
2. Step 2: Convert to fraction form
   15,445.69/20,978.16 = 20,978.16/x
3. Step 3: Cross multiply
   15,445.69x = 20,978.16 × 20,978.16
4. Step 4: Simplify right side
   15,445.69x = 440,083,039.65
5. Step 5: Solve for x
   x = 440,083,039.65/15,445.69
6. Step 6: Final answer
   x = 28,492.29