Finding the Third Proportional to 318,003.47 and 645,233.34

Step by Step Solution

1. Step 1: Write the proportion equation
   318,003.47 : 645,233.34 = 645,233.34 : x
2. Step 2: Convert to fraction form
   318,003.47/645,233.34 = 645,233.34/x
3. Step 3: Cross multiply
   318,003.47x = 645,233.34 × 645,233.34
4. Step 4: Simplify right side
   318,003.47x = 416,326,067,886.81
5. Step 5: Solve for x
   x = 416,326,067,886.81/318,003.47
6. Step 6: Final answer
   x = 1,309,187.19