Finding the Third Proportional to 191,860 and 407,099

Step by Step Solution

1. Step 1: Write the proportion equation
   191,860 : 407,099 = 407,099 : x
2. Step 2: Convert to fraction form
   191,860/407,099 = 407,099/x
3. Step 3: Cross multiply
   191,860x = 407,099 × 407,099
4. Step 4: Simplify right side
   191,860x = 165,729,595,801
5. Step 5: Solve for x
   x = 165,729,595,801/191,860
6. Step 6: Final answer
   x = 863,804.84