Finding the Third Proportional to 111,691 and 240,878

Step by Step Solution

1. Step 1: Write the proportion equation
   111,691 : 240,878 = 240,878 : x
2. Step 2: Convert to fraction form
   111,691/240,878 = 240,878/x
3. Step 3: Cross multiply
   111,691x = 240,878 × 240,878
4. Step 4: Simplify right side
   111,691x = 58,022,210,884
5. Step 5: Solve for x
   x = 58,022,210,884/111,691
6. Step 6: Final answer
   x = 519,488.69