Finding the Third Proportional to 111,688 and 240,870

Step by Step Solution

1. Step 1: Write the proportion equation
   111,688 : 240,870 = 240,870 : x
2. Step 2: Convert to fraction form
   111,688/240,870 = 240,870/x
3. Step 3: Cross multiply
   111,688x = 240,870 × 240,870
4. Step 4: Simplify right side
   111,688x = 58,018,356,900
5. Step 5: Solve for x
   x = 58,018,356,900/111,688
6. Step 6: Final answer
   x = 519,468.13