Finding the Third Proportional to 291,406 and 443,158

Step by Step Solution

1. Step 1: Write the proportion equation
   291,406 : 443,158 = 443,158 : x
2. Step 2: Convert to fraction form
   291,406/443,158 = 443,158/x
3. Step 3: Cross multiply
   291,406x = 443,158 × 443,158
4. Step 4: Simplify right side
   291,406x = 196,389,012,964
5. Step 5: Solve for x
   x = 196,389,012,964/291,406
6. Step 6: Final answer
   x = 673,936.07