Finding the Third Proportional to 271,560 and 391,140

Step by Step Solution

1. Step 1: Write the proportion equation
   271,560 : 391,140 = 391,140 : x
2. Step 2: Convert to fraction form
   271,560/391,140 = 391,140/x
3. Step 3: Cross multiply
   271,560x = 391,140 × 391,140
4. Step 4: Simplify right side
   271,560x = 152,990,499,600
5. Step 5: Solve for x
   x = 152,990,499,600/271,560
6. Step 6: Final answer
   x = 563,376.42