Finding the Third Proportional to 309,578.63 and 632,279.25

Step by Step Solution

1. Step 1: Write the proportion equation
   309,578.63 : 632,279.25 = 632,279.25 : x
2. Step 2: Convert to fraction form
   309,578.63/632,279.25 = 632,279.25/x
3. Step 3: Cross multiply
   309,578.63x = 632,279.25 × 632,279.25
4. Step 4: Simplify right side
   309,578.63x = 399,777,049,980.56
5. Step 5: Solve for x
   x = 399,777,049,980.56/309,578.63
6. Step 6: Final answer
   x = 1,291,358.70