Finding the Third Proportional to 642,493.50 and 1,428,599.25

Step by Step Solution

1. Step 1: Write the proportion equation
   642,493.50 : 1,428,599.25 = 1,428,599.25 : x
2. Step 2: Convert to fraction form
   642,493.50/1,428,599.25 = 1,428,599.25/x
3. Step 3: Cross multiply
   642,493.50x = 1,428,599.25 × 1,428,599.25
4. Step 4: Simplify right side
   642,493.50x = 2,040,895,817,100.56
5. Step 5: Solve for x
   x = 2,040,895,817,100.56/642,493.50
6. Step 6: Final answer
   x = 3,176,523.68