Finding the Third Proportional to 188,420 and 404,140

Step by Step Solution

1. Step 1: Write the proportion equation
   188,420 : 404,140 = 404,140 : x
2. Step 2: Convert to fraction form
   188,420/404,140 = 404,140/x
3. Step 3: Cross multiply
   188,420x = 404,140 × 404,140
4. Step 4: Simplify right side
   188,420x = 163,329,139,600
5. Step 5: Solve for x
   x = 163,329,139,600/188,420
6. Step 6: Final answer
   x = 866,835.47