Finding the Third Proportional to 291,138 and 374,499

Step by Step Solution

1. Step 1: Write the proportion equation
   291,138 : 374,499 = 374,499 : x
2. Step 2: Convert to fraction form
   291,138/374,499 = 374,499/x
3. Step 3: Cross multiply
   291,138x = 374,499 × 374,499
4. Step 4: Simplify right side
   291,138x = 140,249,501,001
5. Step 5: Solve for x
   x = 140,249,501,001/291,138
6. Step 6: Final answer
   x = 481,728.60