Finding the Third Proportional to 191,262 and 390,972

Step by Step Solution

1. Step 1: Write the proportion equation
   191,262 : 390,972 = 390,972 : x
2. Step 2: Convert to fraction form
   191,262/390,972 = 390,972/x
3. Step 3: Cross multiply
   191,262x = 390,972 × 390,972
4. Step 4: Simplify right side
   191,262x = 152,859,104,784
5. Step 5: Solve for x
   x = 152,859,104,784/191,262
6. Step 6: Final answer
   x = 799,213.15