Finding the Third Proportional to 643,875 and 1,398,558

Step by Step Solution

1. Step 1: Write the proportion equation
   643,875 : 1,398,558 = 1,398,558 : x
2. Step 2: Convert to fraction form
   643,875/1,398,558 = 1,398,558/x
3. Step 3: Cross multiply
   643,875x = 1,398,558 × 1,398,558
4. Step 4: Simplify right side
   643,875x = 1,955,964,479,364
5. Step 5: Solve for x
   x = 1,955,964,479,364/643,875
6. Step 6: Final answer
   x = 3,037,801.56