Finding the Third Proportional to 318,100.50 and 680,332.50

Step by Step Solution

1. Step 1: Write the proportion equation
   318,100.50 : 680,332.50 = 680,332.50 : x
2. Step 2: Convert to fraction form
   318,100.50/680,332.50 = 680,332.50/x
3. Step 3: Cross multiply
   318,100.50x = 680,332.50 × 680,332.50
4. Step 4: Simplify right side
   318,100.50x = 462,852,310,556.25
5. Step 5: Solve for x
   x = 462,852,310,556.25/318,100.50
6. Step 6: Final answer
   x = 1,455,050.56