Finding the Third Proportional to 290,088 and 443,718

Step by Step Solution

1. Step 1: Write the proportion equation
   290,088 : 443,718 = 443,718 : x
2. Step 2: Convert to fraction form
   290,088/443,718 = 443,718/x
3. Step 3: Cross multiply
   290,088x = 443,718 × 443,718
4. Step 4: Simplify right side
   290,088x = 196,885,663,524
5. Step 5: Solve for x
   x = 196,885,663,524/290,088
6. Step 6: Final answer
   x = 678,710.13