Finding the Third Proportional to 111,931 and 155,136

Step by Step Solution

1. Step 1: Write the proportion equation
   111,931 : 155,136 = 155,136 : x
2. Step 2: Convert to fraction form
   111,931/155,136 = 155,136/x
3. Step 3: Cross multiply
   111,931x = 155,136 × 155,136
4. Step 4: Simplify right side
   111,931x = 24,067,178,496
5. Step 5: Solve for x
   x = 24,067,178,496/111,931
6. Step 6: Final answer
   x = 215,017.99