Finding the Third Proportional to 290,020 and 448,254

Step by Step Solution

1. Step 1: Write the proportion equation
   290,020 : 448,254 = 448,254 : x
2. Step 2: Convert to fraction form
   290,020/448,254 = 448,254/x
3. Step 3: Cross multiply
   290,020x = 448,254 × 448,254
4. Step 4: Simplify right side
   290,020x = 200,931,648,516
5. Step 5: Solve for x
   x = 200,931,648,516/290,020
6. Step 6: Final answer
   x = 692,819.97