Finding the Third Proportional to 186,071 and 393,978

Step by Step Solution

1. Step 1: Write the proportion equation
   186,071 : 393,978 = 393,978 : x
2. Step 2: Convert to fraction form
   186,071/393,978 = 393,978/x
3. Step 3: Cross multiply
   186,071x = 393,978 × 393,978
4. Step 4: Simplify right side
   186,071x = 155,218,664,484
5. Step 5: Solve for x
   x = 155,218,664,484/186,071
6. Step 6: Final answer
   x = 834,190.52