Finding the Third Proportional to 272,809.50 and 643,084.50

Step by Step Solution

1. Step 1: Write the proportion equation
   272,809.50 : 643,084.50 = 643,084.50 : x
2. Step 2: Convert to fraction form
   272,809.50/643,084.50 = 643,084.50/x
3. Step 3: Cross multiply
   272,809.50x = 643,084.50 × 643,084.50
4. Step 4: Simplify right side
   272,809.50x = 413,557,674,140.25
5. Step 5: Solve for x
   x = 413,557,674,140.25/272,809.50
6. Step 6: Final answer
   x = 1,515,921.09