Finding the Third Proportional to 191,272 and 390,992

Step by Step Solution

1. Step 1: Write the proportion equation
   191,272 : 390,992 = 390,992 : x
2. Step 2: Convert to fraction form
   191,272/390,992 = 390,992/x
3. Step 3: Cross multiply
   191,272x = 390,992 × 390,992
4. Step 4: Simplify right side
   191,272x = 152,874,744,064
5. Step 5: Solve for x
   x = 152,874,744,064/191,272
6. Step 6: Final answer
   x = 799,253.13