Finding the Third Proportional to 643,878 and 1,398,562.50

Step by Step Solution

1. Step 1: Write the proportion equation
   643,878 : 1,398,562.50 = 1,398,562.50 : x
2. Step 2: Convert to fraction form
   643,878/1,398,562.50 = 1,398,562.50/x
3. Step 3: Cross multiply
   643,878x = 1,398,562.50 × 1,398,562.50
4. Step 4: Simplify right side
   643,878x = 1,955,977,066,406.25
5. Step 5: Solve for x
   x = 1,955,977,066,406.25/643,878
6. Step 6: Final answer
   x = 3,037,806.95