Finding the Third Proportional to 243,184 and 388,490

Step by Step Solution

1. Step 1: Write the proportion equation
   243,184 : 388,490 = 388,490 : x
2. Step 2: Convert to fraction form
   243,184/388,490 = 388,490/x
3. Step 3: Cross multiply
   243,184x = 388,490 × 388,490
4. Step 4: Simplify right side
   243,184x = 150,924,480,100
5. Step 5: Solve for x
   x = 150,924,480,100/243,184
6. Step 6: Final answer
   x = 620,618.46