Finding the Third Proportional to 548,322 and 817,918.50

Step by Step Solution

1. Step 1: Write the proportion equation
   548,322 : 817,918.50 = 817,918.50 : x
2. Step 2: Convert to fraction form
   548,322/817,918.50 = 817,918.50/x
3. Step 3: Cross multiply
   548,322x = 817,918.50 × 817,918.50
4. Step 4: Simplify right side
   548,322x = 668,990,672,642.25
5. Step 5: Solve for x
   x = 668,990,672,642.25/548,322
6. Step 6: Final answer
   x = 1,220,069.00