Finding the Third Proportional to 189,878 and 404,300

Step by Step Solution

1. Step 1: Write the proportion equation
   189,878 : 404,300 = 404,300 : x
2. Step 2: Convert to fraction form
   189,878/404,300 = 404,300/x
3. Step 3: Cross multiply
   189,878x = 404,300 × 404,300
4. Step 4: Simplify right side
   189,878x = 163,458,490,000
5. Step 5: Solve for x
   x = 163,458,490,000/189,878
6. Step 6: Final answer
   x = 860,860.61