Finding the Third Proportional to 355,790 and 550,308

Step by Step Solution

1. Step 1: Write the proportion equation
   355,790 : 550,308 = 550,308 : x
2. Step 2: Convert to fraction form
   355,790/550,308 = 550,308/x
3. Step 3: Cross multiply
   355,790x = 550,308 × 550,308
4. Step 4: Simplify right side
   355,790x = 302,838,894,864
5. Step 5: Solve for x
   x = 302,838,894,864/355,790
6. Step 6: Final answer
   x = 851,173.15