Finding the Third Proportional to 422,643 and 626,980.50

Step by Step Solution

1. Step 1: Write the proportion equation
   422,643 : 626,980.50 = 626,980.50 : x
2. Step 2: Convert to fraction form
   422,643/626,980.50 = 626,980.50/x
3. Step 3: Cross multiply
   422,643x = 626,980.50 × 626,980.50
4. Step 4: Simplify right side
   422,643x = 393,104,547,380.25
5. Step 5: Solve for x
   x = 393,104,547,380.25/422,643
6. Step 6: Final answer
   x = 930,110.16