Finding the Third Proportional to 453,907.50 and 636,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   453,907.50 : 636,139.50 = 636,139.50 : x
2. Step 2: Convert to fraction form
   453,907.50/636,139.50 = 636,139.50/x
3. Step 3: Cross multiply
   453,907.50x = 636,139.50 × 636,139.50
4. Step 4: Simplify right side
   453,907.50x = 404,673,463,460.25
5. Step 5: Solve for x
   x = 404,673,463,460.25/453,907.50
6. Step 6: Final answer
   x = 891,532.89