Finding the Third Proportional to 111,572 and 240,640

Step by Step Solution

1. Step 1: Write the proportion equation
   111,572 : 240,640 = 240,640 : x
2. Step 2: Convert to fraction form
   111,572/240,640 = 240,640/x
3. Step 3: Cross multiply
   111,572x = 240,640 × 240,640
4. Step 4: Simplify right side
   111,572x = 57,907,609,600
5. Step 5: Solve for x
   x = 57,907,609,600/111,572
6. Step 6: Final answer
   x = 519,015.61