Finding the Third Proportional to 408,142.69 and 643,516.88

Step by Step Solution

1. Step 1: Write the proportion equation
   408,142.69 : 643,516.88 = 643,516.88 : x
2. Step 2: Convert to fraction form
   408,142.69/643,516.88 = 643,516.88/x
3. Step 3: Cross multiply
   408,142.69x = 643,516.88 × 643,516.88
4. Step 4: Simplify right side
   408,142.69x = 414,113,968,409.77
5. Step 5: Solve for x
   x = 414,113,968,409.77/408,142.69
6. Step 6: Final answer
   x = 1,014,630.38