Finding the Third Proportional to 111,911 and 228,991

Step by Step Solution

1. Step 1: Write the proportion equation
   111,911 : 228,991 = 228,991 : x
2. Step 2: Convert to fraction form
   111,911/228,991 = 228,991/x
3. Step 3: Cross multiply
   111,911x = 228,991 × 228,991
4. Step 4: Simplify right side
   111,911x = 52,436,878,081
5. Step 5: Solve for x
   x = 52,436,878,081/111,911
6. Step 6: Final answer
   x = 468,558.75