Finding the Third Proportional to 10,365.75 and 21,156.75

Step by Step Solution

1. Step 1: Write the proportion equation
   10,365.75 : 21,156.75 = 21,156.75 : x
2. Step 2: Convert to fraction form
   10,365.75/21,156.75 = 21,156.75/x
3. Step 3: Cross multiply
   10,365.75x = 21,156.75 × 21,156.75
4. Step 4: Simplify right side
   10,365.75x = 447,608,070.56
5. Step 5: Solve for x
   x = 447,608,070.56/10,365.75
6. Step 6: Final answer
   x = 43,181.45